[string-refs] make disableStringRefs a dynamic www flag (#31175)

Author: kassens

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

@@ -18,6 +18,7 @@ export const disableDefaultPropsExceptForClasses = __VARIANT__;
 export const disableLegacyContextForFunctionComponents = __VARIANT__;
 export const disableLegacyMode = __VARIANT__;
 export const disableSchedulerTimeoutInWorkLoop = __VARIANT__;
+export const disableStringRefs = __VARIANT__;
 export const enableDeferRootSchedulingToMicrotask = __VARIANT__;
 export const enableDO_NOT_USE_disableStrictPassiveEffect = __VARIANT__;
 export const enableHiddenSubtreeInsertionEffectCleanup = __VARIANT__;

packages/shared/forks/ReactFeatureFlags.www.js

@@ -19,6 +19,7 @@ export const {
   disableDefaultPropsExceptForClasses,
   disableLegacyContextForFunctionComponents,
   disableSchedulerTimeoutInWorkLoop,
+  disableStringRefs,
   enableDebugTracing,
   enableDeferRootSchedulingToMicrotask,
   enableDO_NOT_USE_disableStrictPassiveEffect,
@@ -120,10 +121,6 @@ export const enableServerComponentLogs = true;
 export const enableReactTestRendererWarning = false;
 export const useModernStrictMode = 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 disableStringRefs = false;
-
 export const disableLegacyMode: boolean =
   __EXPERIMENTAL__ || dynamicFeatureFlags.disableLegacyMode;