Output where preference is saved (#31305)

Fixes #31241



## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes by running `yarn lint`

Author: timneutkens

packages/next/cli/next-telemetry.ts

@@ -53,9 +53,13 @@ const nextTelemetry: cliCommand = (argv) => {
 
     isEnabled = true
   } else if (args['--disable'] || args._[0] === 'disable') {
-    telemetry.setEnabled(false)
+    const path = telemetry.setEnabled(false)
     if (isEnabled) {
-      console.log(chalk.cyan('Your preference has been saved.'))
+      console.log(
+        chalk.cyan(
+          `Your preference has been saved${path ? ` to ${path}` : ''}.`
+        )
+      )
     } else {
       console.log(
         chalk.yellow(`Next.js' telemetry collection is already disabled.`)

packages/next/telemetry/storage.ts

@@ -138,6 +138,7 @@ export class Telemetry {
   setEnabled = (_enabled: boolean) => {
     const enabled = !!_enabled
     this.conf && this.conf.set(TELEMETRY_KEY_ENABLED, enabled)
+    return this.conf && this.conf.path
   }
 
   get isEnabled(): boolean {