Make enableRefAsProp www dynamic (#28423)

Going to start rolling this out

Author: rickhanlonii

packages/shared/forks/ReactFeatureFlags.www-dynamic.js

@@ -29,6 +29,7 @@ export const enableDO_NOT_USE_disableStrictPassiveEffect = __VARIANT__;
 export const enableUseDeferredValueInitialArg = __VARIANT__;
 export const enableRenderableContext = __VARIANT__;
 export const useModernStrictMode = __VARIANT__;
+export const enableRefAsProp = __VARIANT__;
 
 export const enableRetryLaneExpiration = __VARIANT__;
 export const retryLaneExpirationMs = 5000;

packages/shared/forks/ReactFeatureFlags.www.js

@@ -37,6 +37,7 @@ export const {
   enableInfiniteRenderLoopDetection,
   enableRenderableContext,
   useModernStrictMode,
+  enableRefAsProp,
 } = dynamicFeatureFlags;
 
 // On WWW, __EXPERIMENTAL__ is used for a new modern build.
@@ -117,9 +118,5 @@ export const disableClientCache = true;
 export const enableServerComponentKeys = true;
 export const enableServerComponentLogs = true;
 
-// TODO: Roll out with GK. Don't keep as dynamic flag for too long, though,
-// because JSX is an extremely hot path.
-export const enableRefAsProp = false;
-
 // Flow magic to verify the exports of this file match the original version.
 ((((null: any): ExportsType): FeatureFlagsType): ExportsType);