Restore react-native/setup-env references on main (#57560)

Summary:
Pull Request resolved: #57560

Reverts D112002434.

This fix was needed on `0.87-stable` but not on `main`, since the `setup-env`-in-bundle-graph fix (#57492) was already present, see file at time of D112002434:

https://github.com/react/react-native/blob/08c323346be6c0fbbd70900d48435f977a78a1bb/packages/react-native/Libraries/Core/InitializeCore.js#L30-L37

See #57559 for more info.

Changelog: [Internal]

Reviewed By: zeyap

Differential Revision: D112101450

fbshipit-source-id: 435a24e72415e18b5e3d6a5144ed805adc415a95

Author: huntie

packages/community-cli-plugin/src/utils/loadMetroConfig.js

@@ -58,15 +58,15 @@ function getCommunityCliDefaultConfig(
   return {
     resolver,
     serializer: {
-      // We can include multiple copies of InitializeCore here because metro will
+      // We can include multiple copies of setup-env here because Metro will
       // only add ones that are already part of the bundle
       getModulesRunBeforeMainModule: () => [
-        require.resolve('react-native/Libraries/Core/InitializeCore', {
+        require.resolve('react-native/setup-env', {
           paths: [ctx.root],
         }),
         ...outOfTreePlatforms.map(platform =>
           require.resolve(
-            `${ctx.platforms[platform].npmPackageName}/Libraries/Core/InitializeCore`,
+            `${ctx.platforms[platform].npmPackageName}/setup-env`,
             {paths: [ctx.root]},
           ),
         ),

packages/metro-config/src/index.flow.js

@@ -61,7 +61,7 @@ export function getDefaultConfig(projectRoot: string): ConfigT {
     serializer: {
       // NOTE: Overridden in community-cli-plugin
       getModulesRunBeforeMainModule: () => [
-        require.resolve('react-native/Libraries/Core/InitializeCore'),
+        require.resolve('react-native/setup-env'),
       ],
       getPolyfills: () => require('@react-native/js-polyfills')(),
       isThirdPartyModule({path: modulePath}: Readonly<{path: string, ...}>) {