Use public unstable_TextAncestorContext API (#477)

* Use public unstable_TextAncestorContext API

React Native 0.81 exposed TextAncestorContext as a public API
(react/react-native#52368). Switch from the deep import path
'react-native/Libraries/Text/TextAncestor' to the public
'unstable_TextAncestorContext' export.

The deep-import target file in React Native exists solely as a
backwards-compatibility shim for react-strict-dom — see
https://github.com/facebook/react-native/blob/main/packages/react-native/Libraries/Text/TextAncestor.js
which carries a TODO from @huntie to delete it once this cross-repo
reference is fixed.

Same React Context object, no behavioral change. Test mock updated
to match the new import path; old deep-import mock deleted.

* Update benchmark react-native mock for unstable_TextAncestorContext

---------

Co-authored-by: Yamin Yassin <Yamin.Yassin+CAG@cagtechhub.com>

Author: yaminyassin

packages/benchmarks/perf/mocks/TextAncestorContext.js

@@ -111,6 +111,8 @@ export const TextInput = 'TextInput';
 
 export const Text = 'Text';
 
+export const unstable_TextAncestorContext = 'TextAncestorContext';
+
 export const View = 'View';
 
 export const experimental_LayoutConformance = 'LayoutConformance';

packages/benchmarks/perf/mocks/react-native.js

@@ -43,13 +43,6 @@ const config = [
               __dirname,
               './mocks/ViewNativeComponent.js'
             )
-          },
-          {
-            find: 'react-native/Libraries/Text/TextAncestor',
-            replacement: path.resolve(
-              __dirname,
-              './mocks/TextAncestorContext.js'
-            )
           }
         ]
       }),

packages/benchmarks/perf/rollup.config.mjs

@@ -7,5 +7,5 @@
  * @flow strict-local
  */
 
-import TextAncestorContext from 'react-native/Libraries/Text/TextAncestor';
+import { unstable_TextAncestorContext as TextAncestorContext } from 'react-native';
 export { TextAncestorContext };

packages/react-strict-dom/src/native/react-native/TextAncestorContext.js

@@ -120,6 +120,8 @@ export const View = 'View';
 
 export const experimental_LayoutConformance = 'LayoutConformance';
 
+export const unstable_TextAncestorContext = 'TextAncestorContext';
+
 export const useColorScheme = jest.fn().mockReturnValue('light');
 
 export const useWindowDimensions = jest