[rn] delete the legacy renderers from the sync (#34946)

Now that RN is only on the New Architecture, we can stop stop syncing
the legacy React Native renderers.

In this diff, I just stop syncing them. In a follow up I'll delete the
code for them so only Fabric is left.

This will also allow us to remove the `enableLegacyMode` feature flag.

scripts/rollup/bundles.js

@@ -819,42 +819,6 @@ const bundles = [
       }),
   },
 
-  /******* React Native *******/
-  {
-    bundleTypes: __EXPERIMENTAL__
-      ? []
-      : [RN_FB_DEV, RN_FB_PROD, RN_FB_PROFILING],
-    moduleType: RENDERER,
-    entry: 'react-native-renderer',
-    global: 'ReactNativeRenderer',
-    externals: ['react-native', 'ReactNativeInternalFeatureFlags'],
-    minifyWithProdErrorCodes: false,
-    wrapWithModuleBoundaries: true,
-    babel: opts =>
-      Object.assign({}, opts, {
-        plugins: opts.plugins.concat([
-          [require.resolve('@babel/plugin-transform-classes'), {loose: true}],
-        ]),
-      }),
-  },
-  {
-    bundleTypes: [RN_OSS_DEV, RN_OSS_PROD, RN_OSS_PROFILING],
-    moduleType: RENDERER,
-    entry: 'react-native-renderer',
-    global: 'ReactNativeRenderer',
-    // ReactNativeInternalFeatureFlags temporary until we land enableRemoveConsolePatches.
-    // Needs to be done before the next RN OSS release.
-    externals: ['react-native', 'ReactNativeInternalFeatureFlags'],
-    minifyWithProdErrorCodes: false,
-    wrapWithModuleBoundaries: true,
-    babel: opts =>
-      Object.assign({}, opts, {
-        plugins: opts.plugins.concat([
-          [require.resolve('@babel/plugin-transform-classes'), {loose: true}],
-        ]),
-      }),
-  },
-
   /******* React Native Fabric *******/
   {
     bundleTypes: __EXPERIMENTAL__

scripts/rollup/shims/react-native/ReactNative.js

@@ -14,6 +14,7 @@ import type {ReactNativeType} from './ReactNativeTypes';
 
 let ReactNative: ReactNativeType;
 
+// TODO: Delete the legacy renderer. Only ReactFabric is used now.
 if (__DEV__) {
   ReactNative = require('../implementations/ReactNativeRenderer-dev');
 } else {