[flags] Cleanup enableActivity (#35681)

Author: eps1lon

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

@@ -54,7 +54,6 @@ describe('ReactDOMActivity', () => {
     return <span prop={props.text}>{props.children}</span>;
   }
 
-  // @gate enableActivity
   it(
     'hiding an Activity boundary also hides the direct children of any ' +
       'portals it contains, regardless of how deeply nested they are',
@@ -100,7 +99,6 @@ describe('ReactDOMActivity', () => {
     },
   );
 
-  // @gate enableActivity
   it(
     'revealing an Activity boundary inside a portal does not reveal the ' +
       'portal contents if has a hidden Activity parent',
@@ -151,7 +149,6 @@ describe('ReactDOMActivity', () => {
     },
   );
 
-  // @gate enableActivity
   it('hides new portals added to an already hidden tree', async () => {
     function Child() {
       return <Text text="Child" />;
@@ -218,7 +215,6 @@ describe('ReactDOMActivity', () => {
     );
   });
 
-  // @gate enableActivity
   it('hides new insertions inside an already hidden portal', async () => {
     function Child({text}) {
       useLayoutEffect(() => {
@@ -289,7 +285,6 @@ describe('ReactDOMActivity', () => {
     );
   });
 
-  // @gate enableActivity
   it('reveal an inner Suspense boundary without revealing an outer Activity on the same host child', async () => {
     const promise = new Promise(() => {});
 
@@ -390,7 +385,6 @@ describe('ReactDOMActivity', () => {
     );
   });
 
-  // @gate enableActivity
   it('mounts/unmounts layout effects in portal when visibility changes (starting visible)', async () => {
     function Child() {
       useLayoutEffect(() => {
@@ -440,7 +434,6 @@ describe('ReactDOMActivity', () => {
     );
   });
 
-  // @gate enableActivity
   it('mounts/unmounts layout effects in portal when visibility changes (starting hidden)', async () => {
     function Child() {
       useLayoutEffect(() => {

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

@@ -763,7 +763,7 @@ describe('FragmentRefs', () => {
       });
 
       describe('with activity', () => {
-        // @gate enableFragmentRefs && enableActivity
+        // @gate enableFragmentRefs
         it('does not apply event listeners to hidden trees', async () => {
           const parentRef = React.createRef();
           const fragmentRef = React.createRef();
@@ -799,7 +799,7 @@ describe('FragmentRefs', () => {
           expect(logs).toEqual(['Child 1', 'Child 3']);
         });
 
-        // @gate enableFragmentRefs && enableActivity
+        // @gate enableFragmentRefs
         it('applies event listeners to visible trees', async () => {
           const parentRef = React.createRef();
           const fragmentRef = React.createRef();
@@ -835,7 +835,7 @@ describe('FragmentRefs', () => {
           expect(logs).toEqual(['Child 1', 'Child 2', 'Child 3']);
         });
 
-        // @gate enableFragmentRefs && enableActivity
+        // @gate enableFragmentRefs
         it('handles Activity modes switching', async () => {
           const fragmentRef = React.createRef();
           const fragmentRef2 = React.createRef();

packages/react-dom/src/__tests__/ReactDOMServerPartialHydration-test.internal.js

@@ -3668,7 +3668,6 @@ describe('ReactDOMServerPartialHydration', () => {
     expect(ref.current.innerHTML).toBe('Hidden child');
   });
 
-  // @gate enableActivity
   it('a visible Activity component is surrounded by comment markers', async () => {
     const ref = React.createRef();
 
@@ -3706,7 +3705,6 @@ describe('ReactDOMServerPartialHydration', () => {
     expect(ref.current).toBe(span);
   });
 
-  // @gate enableActivity
   it('a hidden Activity component is skipped over during server rendering', async () => {
     const visibleRef = React.createRef();