[Native] Add FeatureFlag to dispatch events with instance targets (#17323)

* [Native] Add FeatureFlag to dispatch events with instance targets

* Prettier

scripts/flow/react-native-host-hooks.js

@@ -181,4 +181,5 @@ declare module 'RTManager' {
 // shims/ReactFeatureFlags is generated by the packaging script
 declare module '../shims/ReactFeatureFlags' {
   declare export var debugRenderPhaseSideEffects: boolean;
+  declare export var enableNativeTargetAsInstance: boolean;
 }

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

@@ -12,6 +12,7 @@
 
 const ReactFeatureFlags = {
   debugRenderPhaseSideEffects: false,
+  enableNativeTargetAsInstance: false,
 };
 
 module.exports = ReactFeatureFlags;