Remove unstable_enableLogBox (#49427)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/49427

Also refine lint/`$FlowFixMe`s in `index.js`.

Changelog:
[General][Breaking] Remove deprecated `unstable_enableLogBox` function. LogBox is enabled by default.

Reviewed By: cortinico

Differential Revision: D69656713

fbshipit-source-id: 21ce775c84e17da036583f099a17f6524f9b9bf1

packages/react-native/Libraries/__tests__/__snapshots__/public-api-test.js.snap

@@ -8959,7 +8959,6 @@ declare module.exports: {
     uiViewClassName: string
   ) => HostComponent<T>,
   get RootTagContext(): RootTagContext,
-  get unstable_enableLogBox(): () => void,
 };
 "
 `;

packages/react-native/index.js

@@ -8,6 +8,8 @@
  * @flow
  */
 
+/* eslint-disable lint/no-commonjs-exports */
+
 'use strict';
 'use client';
 
@@ -119,7 +121,6 @@ module.exports = {
   get Button(): Button {
     return require('./Libraries/Components/Button').default;
   },
-  // $FlowFixMe[value-as-type]
   get DrawerLayoutAndroid(): DrawerLayoutAndroid {
     return require('./Libraries/Components/DrawerAndroid/DrawerLayoutAndroid')
       .default;
@@ -151,7 +152,6 @@ module.exports = {
   get Pressable(): Pressable {
     return require('./Libraries/Components/Pressable/Pressable').default;
   },
-  // $FlowFixMe[value-as-type]
   get ProgressBarAndroid(): ProgressBarAndroid {
     warnOnce(
       'progress-bar-android-moved',
@@ -225,7 +225,6 @@ module.exports = {
   // Include any types exported in the Animated module together with its default export, so
   // you can references types such as Animated.Numeric
   get Animated(): {...$Diff<AnimatedModule, {default: any}>, ...Animated} {
-    // $FlowExpectedError[prop-missing]: we only return the default export, all other exports are types
     return require('./Libraries/Animated/Animated').default;
   },
   get Appearance(): Appearance {
@@ -326,7 +325,6 @@ module.exports = {
   get Systrace(): Systrace {
     return require('./Libraries/Performance/Systrace');
   },
-  // $FlowFixMe[value-as-type]
   get ToastAndroid(): ToastAndroid {
     return require('./Libraries/Components/ToastAndroid/ToastAndroid').default;
   },
@@ -391,12 +389,6 @@ module.exports = {
   get RootTagContext(): RootTagContext {
     return require('./Libraries/ReactNative/RootTag').RootTagContext;
   },
-  get unstable_enableLogBox(): () => void {
-    return () =>
-      console.warn(
-        'LogBox is enabled by default so there is no need to call unstable_enableLogBox() anymore. This is a no op and will be removed in the next version.',
-      );
-  },
 };
 
 if (__DEV__) {