react-dom/server-rendering-stub: restore experimental prefix for useFormState and useFormStatus (facebook#27470)

in facebook#27461 the experimental prefix was added back for `useFormState` and
`useFormStatus` in react-dom. However these functions are also exported
from the server rendering stub too and when using the stub with
experimental prefixes their absence causes unexpected errors.

This change adds back the experimental prefix for these two hooks to
match the experimental build of react-dom.

Author: gnoff

packages/react-dom/server-rendering-stub.js

@@ -28,3 +28,30 @@ export {
   useFormState,
   unstable_batchedUpdates,
 } from './src/server/ReactDOMServerRenderingStub';
+
+import type {FormStatus} from 'react-dom-bindings/src/shared/ReactDOMFormActions';
+import {useFormStatus, useFormState} from './src/client/ReactDOM';
+
+export function experimental_useFormStatus(): FormStatus {
+  if (__DEV__) {
+    console.error(
+      'useFormStatus is now in canary. Remove the experimental_ prefix. ' +
+        'The prefixed alias will be removed in an upcoming release.',
+    );
+  }
+  return useFormStatus();
+}
+
+export function experimental_useFormState<S, P>(
+  action: (S, P) => Promise<S>,
+  initialState: S,
+  permalink?: string,
+): [S, (P) => void] {
+  if (__DEV__) {
+    console.error(
+      'useFormState is now in canary. Remove the experimental_ prefix. ' +
+        'The prefixed alias will be removed in an upcoming release.',
+    );
+  }
+  return useFormState(action, initialState, permalink);
+}