Restore react-native/setup-env references on main

[huntie]

Summary:
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:

react-native/packages/react-native/Libraries/Core/InitializeCore.js

Lines 30 to 37 in 08c3233

	// NOTE: This delegates to the `'react-native/setup-env'` entry point (rather
	// than calling `setUpDefaultReactNativeEnvironment` directly) so that
	// `src/setup-env.js` is pulled into the module graph. Metro's
	// `getModulesRunBeforeMainModule` only runs modules that are already part of
	// the bundle, and `InitializeCore` is a guaranteed graph entry (via
	// `ReactNativePrivateInitializeCore`). This keeps `'react-native/setup-env'`
	// reachable so it runs before the main module.
	require('../../src/setup-env');

See #57559 for more info.

Changelog: [Internal]

Differential Revision: D112101450

[meta-codesync]

@huntie has exported this pull request. If you are a Meta employee, you can view the originating Diff in D112101450.