Fork ReactDOMSharedInternals for www (#25791)

This isn't the right way to do this, but internally we have some
restrictions so we need to add an indirection. Let's land this now so we
can catch up our sync and then fix forward from there.

Co-authored-by: Jan Kassens <jkassens@meta.com>

scripts/rollup/forks.js

@@ -70,6 +70,14 @@ const forks = Object.freeze({
     if (entry === 'react-dom' || entry === 'react-dom/server-rendering-stub') {
       return './packages/react-dom/src/ReactDOMSharedInternals.js';
     }
+    switch (bundleType) {
+      case FB_WWW_DEV:
+      case FB_WWW_PROD:
+      case FB_WWW_PROFILING:
+        return './packages/shared/forks/ReactDOMSharedInternals.www.js';
+      default:
+        break;
+    }
     if (
       !entry.startsWith('react-dom/') &&
       dependencies.indexOf('react-dom') === -1