s/form state/action state (facebook#28631)

Rename internals from "form state" to "action state"

Author: rickhanlonii

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

@@ -6187,8 +6187,8 @@ describe('ReactDOMFizzServer', () => {
       // Because of the render phase update above, this component is evaluated
       // multiple times (even during SSR), but it should only emit a single
       // marker per useActionState instance.
-      const [formState] = useActionState(action, 0);
-      const text = `${readText('Child')}:${formState}:${localState}`;
+      const [actionState] = useActionState(action, 0);
+      const text = `${readText('Child')}:${actionState}:${localState}`;
       return (
         <div id="child" ref={childRef}>
           {text}

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

@@ -1280,7 +1280,7 @@ describe('ReactDOMForm', () => {
   });
 
   // @gate enableAsyncActions
-  test('useFormState works in StrictMode', async () => {
+  test('useActionState works in StrictMode', async () => {
     let actionCounter = 0;
     async function action(state, type) {
       actionCounter++;