Set renameElementSymbol to dynamic value (#30066)

Prepare to roll this out with dynamic flag

`yarn flags --diff www canary`

<img width="514" alt="Screenshot 2024-06-24 at 11 33 55 AM"
src="https://github.com/facebook/react/assets/8965173/31508fdc-4cb1-4ce0-8e22-c02a034377b0">

packages/react-dom/src/__tests__/ReactDOMOption-test.js

@@ -134,7 +134,7 @@ describe('ReactDOMOption', () => {
     }).rejects.toThrow('Objects are not valid as a React child');
   });
 
-  // @gate www
+  // @gate www && !renameElementSymbol
   it('should support element-ish child', async () => {
     // This is similar to <fbt>.
     // We don't toString it because you must instead provide a value prop.

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

@@ -32,6 +32,7 @@ export const syncLaneExpirationMs = 250;
 export const transitionLaneExpirationMs = 5000;
 export const enableAddPropertiesFastPath = __VARIANT__;
 export const disableLegacyMode = __VARIANT__;
+export const renameElementSymbol = __VARIANT__;
 
 // Enable this flag to help with concurrent mode debugging.
 // It logs information to the console about React scheduling, rendering, and commit phases.

packages/shared/forks/ReactFeatureFlags.www.js

@@ -35,6 +35,7 @@ export const {
   enableNoCloningMemoCache,
   enableAddPropertiesFastPath,
   enableFastJSX,
+  renameElementSymbol,
 } = dynamicFeatureFlags;
 
 // On WWW, __EXPERIMENTAL__ is used for a new modern build.
@@ -65,8 +66,6 @@ export const enableSchedulingProfiler: boolean =
 export const disableLegacyContext = __EXPERIMENTAL__;
 export const enableGetInspectorDataForInstanceInProduction = false;
 
-export const renameElementSymbol = false;
-
 export const enableCache = true;
 export const enableLegacyCache = true;