Add useFormStatus to server rendering stub (#26788)

This was an oversight when I set up the hook in #26719.

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

@@ -22,4 +22,5 @@ export {
   preconnect,
   preload,
   preinit,
+  experimental_useFormStatus,
 } from './src/server/ReactDOMServerRenderingStub';

packages/react-dom/src/__tests__/react-dom-server-rendering-stub-test.js

@@ -81,4 +81,16 @@ describe('react-dom-server-rendering-stub', () => {
     );
     expect(x).toBe(false);
   });
+
+  // @gate enableFormActions
+  // @gate enableAsyncActions
+  it('exports experimental_useFormStatus', async () => {
+    function App() {
+      const {pending} = ReactDOM.experimental_useFormStatus();
+      return 'Pending: ' + pending;
+    }
+
+    const result = await ReactDOMFizzServer.renderToStaticMarkup(<App />);
+    expect(result).toEqual('Pending: false');
+  });
 });

packages/react-dom/src/server/ReactDOMServerRenderingStub.js

@@ -8,6 +8,7 @@
  */
 
 export {preinit, preload, preconnect, prefetchDNS} from '../ReactDOMFloat';
+export {useFormStatus as experimental_useFormStatus} from 'react-dom-bindings/src/shared/ReactDOMFormActions';
 
 export function createPortal() {
   throw new Error(