Fix missing VERSION_NATIVE_FB in commit artifacts (#36889)

Summary:
## Summary

The `runtime_commit_artifacts` workflow has been failing in the "move
relevant files for react in fbsource into compiled-rn" step with:

```
mv: cannot stat 'build/facebook-react-native/VERSION_NATIVE_FB': No such file or directory
```

`VERSION_NATIVE_FB` was only written in `processExperimental`, *inside*
`build/facebook-react-native/`. That directory is not part of the
allowlist in the cleanup loop at the end of `processExperimental`, so
the experimental workers wrote the version file and then immediately
deleted it.

This was masked until #36859. The cleanup loop previously used `rm -rm`
(an invalid flag), so `rm` errored out and deleted nothing — the loop
was effectively a no-op. Once it was changed to `fs.rmSync`, the
deletion actually took effect. After CI merges the per-worker artifacts,
`facebook-react-native/*/cjs` still survives (the **stable** workers
produce it and `processStable` has no cleanup loop), but
`VERSION_NATIVE_FB` is gone because stable never wrote it.

## Fix

The `build/facebook-react-native` artifacts are identical across release
channels:
- RN packages resolve to the generic `.fb.js` entry fork (no
`.modern.fb.js` / `.classic.fb.js` split).
- The `native-fb` feature-flag forks don't reference `__EXPERIMENTAL__`.
- The version string is identical
(`<ReactVersion>-native-fb-<sha>-<date>`).

So this writes `VERSION_NATIVE_FB` from `processStable`, where
`facebook-react-native` is preserved, and drops the now-dead write from
`processExperimental`.

## Test Plan

Verified locally by building the `react` package through each code path:

- **Stable channel** (`yarn build --r=stable react/index`):
`build/facebook-react-native/VERSION_NATIVE_FB` is written with the
correct `19.3.0-native-fb-<sha>-<date>` version string. ✅
- **Experimental channel** (`yarn build --r=experimental react/index`):
`build/facebook-react-native` is deleted by the cleanup loop, leaving
only `oss-experimental` and `facebook-www` — confirming the version file
cannot come from this channel. ✅
- **Local merged build** (`yarn build react/index`, builds both channels
and merges): the final `build/facebook-react-native/` contains
`VERSION_NATIVE_FB`, matching what CI produces after merging per-worker
artifacts. ✅

DiffTrain build for [68631c0453b08e2c7c96a40910f4c91db1f66d5a](react/react@68631c0)

Reviewed By: rickhanlonii, zeyap

Differential Revision: D109860005

fbshipit-source-id: e63fd7e887908ee4fbc303f44303ce8384d44c45

Author: javache

packages/react-native/Libraries/Renderer/shims/ReactNativeTypes.js

@@ -7,7 +7,7 @@
  * @noformat
  * @nolint
  * @flow strict
- * @generated SignedSource<<4ab83fd2606d6a4d374ef914f231d9c1>>
+ * @generated SignedSource<<92e869744dd405a4d74b1b6f50fa8d52>>
  */
 
 import type {
@@ -25,42 +25,42 @@ import * as React from 'react';
 
 export type AttributeType<T, V> =
   | true
-  | $ReadOnly<{
+  | Readonly<{
       diff?: (arg1: T, arg2: T) => boolean,
       process?: (arg1: V) => T,
     }>;
 
-// We either force that `diff` and `process` always use mixed,
+// We either force that `diff` and `process` always use unknown,
 // or we allow them to define specific types and use this hack
 export type AnyAttributeType = AttributeType<$FlowFixMe, $FlowFixMe>;
 
-export type AttributeConfiguration = $ReadOnly<{
+export type AttributeConfiguration = Readonly<{
   [propName: string]: AnyAttributeType | void,
-  style?: $ReadOnly<{
+  style?: Readonly<{
     [propName: string]: AnyAttributeType,
     ...
   }>,
   ...
 }>;
 
-export type ViewConfig = $ReadOnly<{
-  Commands?: $ReadOnly<{[commandName: string]: number, ...}>,
-  Constants?: $ReadOnly<{[name: string]: mixed, ...}>,
+export type ViewConfig = Readonly<{
+  Commands?: Readonly<{[commandName: string]: number, ...}>,
+  Constants?: Readonly<{[name: string]: unknown, ...}>,
   Manager?: string,
-  NativeProps?: $ReadOnly<{[propName: string]: string, ...}>,
+  NativeProps?: Readonly<{[propName: string]: string, ...}>,
   baseModuleName?: ?string,
-  bubblingEventTypes?: $ReadOnly<{
-    [eventName: string]: $ReadOnly<{
-      phasedRegistrationNames: $ReadOnly<{
+  bubblingEventTypes?: Readonly<{
+    [eventName: string]: Readonly<{
+      phasedRegistrationNames: Readonly<{
         captured: string,
         bubbled: string,
         skipBubbling?: ?boolean,
       }>,
     }>,
     ...
   }>,
-  directEventTypes?: $ReadOnly<{
-    [eventName: string]: $ReadOnly<{
+  directEventTypes?: Readonly<{
+    [eventName: string]: Readonly<{
       registrationName: string,
     }>,
     ...
@@ -70,30 +70,30 @@ export type ViewConfig = $ReadOnly<{
   validAttributes: AttributeConfiguration,
 }>;
 
-export type PartialViewConfig = $ReadOnly<{
+export type PartialViewConfig = Readonly<{
   bubblingEventTypes?: ViewConfig['bubblingEventTypes'],
   directEventTypes?: ViewConfig['directEventTypes'],
   supportsRawText?: boolean,
   uiViewClassName: string,
   validAttributes?: AttributeConfiguration,
 }>;
 
-type InspectorDataProps = $ReadOnly<{
+type InspectorDataProps = Readonly<{
   [propName: string]: string,
   ...
 }>;
 
 type InspectorDataGetter = (
-  <TElementType: React.ElementType>(
+  <TElementType extends React.ElementType>(
     componentOrHandle: React.ElementRef<TElementType> | number,
   ) => ?number,
-) => $ReadOnly<{
+) => Readonly<{
   measure: (callback: MeasureOnSuccessCallback) => void,
   props: InspectorDataProps,
 }>;
 
-export type InspectorData = $ReadOnly<{
-  closestInstance?: mixed,
+export type InspectorData = Readonly<{
+  closestInstance?: unknown,
   hierarchy: Array<{
     name: ?string,
     getInspectorData: InspectorDataGetter,
@@ -103,11 +103,11 @@ export type InspectorData = $ReadOnly<{
   componentStack: string,
 }>;
 
-export type TouchedViewDataAtPoint = $ReadOnly<
+export type TouchedViewDataAtPoint = Readonly<
   {
     pointerY: number,
     touchedViewTag?: number,
-    frame: $ReadOnly<{
+    frame: Readonly<{
       top: number,
       left: number,
       width: number,
@@ -119,39 +119,39 @@ export type TouchedViewDataAtPoint = $ReadOnly<
 
 export type RenderRootOptions = {
   onUncaughtError?: (
-    error: mixed,
-    errorInfo: {+componentStack?: ?string},
+    error: unknown,
+    errorInfo: {readonly componentStack?: ?string},
   ) => void,
   onCaughtError?: (
-    error: mixed,
+    error: unknown,
     errorInfo: {
-      +componentStack?: ?string,
+      readonly componentStack?: ?string,
       // $FlowFixMe[unclear-type] unknown props and state.
       // $FlowFixMe[value-as-type] Component in react repo is any-typed, but it will be well typed externally.
-      +errorBoundary?: ?React.Component<any, any>,
+      readonly errorBoundary?: ?React.Component<any, any>,
     },
   ) => void,
   onRecoverableError?: (
-    error: mixed,
-    errorInfo: {+componentStack?: ?string},
+    error: unknown,
+    errorInfo: {readonly componentStack?: ?string},
   ) => void,
   onDefaultTransitionIndicator?: () => void | (() => void),
 };
 
-export opaque type Node = mixed;
-export opaque type InternalInstanceHandle = mixed;
+export opaque type Node = unknown;
+export opaque type InternalInstanceHandle = unknown;
 
 export type ReactFabricType = {
-  findHostInstance_DEPRECATED<TElementType: React.ElementType>(
+  findHostInstance_DEPRECATED<TElementType extends React.ElementType>(
     componentOrHandle: ?(React.ElementRef<TElementType> | number),
   ): ?PublicInstance,
-  findNodeHandle<TElementType: React.ElementType>(
+  findNodeHandle<TElementType extends React.ElementType>(
     componentOrHandle: ?(React.ElementRef<TElementType> | number),
   ): ?number,
   dispatchCommand(
     handle: PublicInstance,
     command: string,
-    args: Array<mixed>,
+    args: Array<unknown>,
   ): void,
   isChildPublicInstance(parent: PublicInstance, child: PublicInstance): boolean,
   sendAccessibilityEvent(handle: PublicInstance, eventType: string): void,
@@ -211,7 +211,7 @@ export type LayoutAnimationProperty =
   | 'scaleY'
   | 'scaleXY';
 
-export type LayoutAnimationAnimationConfig = $ReadOnly<{
+export type LayoutAnimationAnimationConfig = Readonly<{
   duration?: number,
   delay?: number,
   springDamping?: number,
@@ -220,7 +220,7 @@ export type LayoutAnimationAnimationConfig = $ReadOnly<{
   property?: LayoutAnimationProperty,
 }>;
 
-export type LayoutAnimationConfig = $ReadOnly<{
+export type LayoutAnimationConfig = Readonly<{
   duration: number,
   create?: LayoutAnimationAnimationConfig,
   update?: LayoutAnimationAnimationConfig,

packages/react-native/Libraries/Renderer/shims/ReactNativeViewConfigRegistry.js

@@ -7,7 +7,7 @@
  * @noformat
  * @nolint
  * @flow strict-local
- * @generated SignedSource<<1f7876c0dc0b05685a730513dc410236>>
+ * @generated SignedSource<<260b8a01781c54c31a520f00cb1bde7f>>
  */
 
 'use strict';
@@ -17,16 +17,16 @@ import invariant from 'invariant';
 
 // Event configs
 export const customBubblingEventTypes: {
-  [eventName: string]: $ReadOnly<{
-    phasedRegistrationNames: $ReadOnly<{
+  [eventName: string]: Readonly<{
+    phasedRegistrationNames: Readonly<{
       captured: string,
       bubbled: string,
       skipBubbling?: ?boolean,
     }>,
   }>,
 } = {};
 export const customDirectEventTypes: {
-  [eventName: string]: $ReadOnly<{
+  [eventName: string]: Readonly<{
     registrationName: string,
   }>,
 } = {};