Only apply isHighlighted native prop on iOS (facebook#38642)

Summary:
Pull Request resolved: facebook#38642

isHighlighted is only used for iOS. Even macOS disables it (see microsoft#1346).

This change ensures that the isHighlighted prop is only updated for iOS.

## Changelog:

[General] [Fixed] - Avoids re-renders during text selection on desktop platforms by limiting native-only `isHighlighted` prop to iOS

Reviewed By: lenaic, sammy-SC

Differential Revision: D47800845

fbshipit-source-id: 9888db039f5b955da0c3dfa43dd304f3f4d01f19

packages/react-native/Libraries/Text/Text.js

@@ -105,7 +105,13 @@ const Text: React.AbstractComponent<
             onLongPress,
             onPress,
             onPressIn(event: PressEvent) {
-              setHighlighted(!suppressHighlighting);
+              // Updating isHighlighted causes unnecessary re-renders for platforms that don't use it
+              // in the best case, and cause issues with text selection in the worst case. Forcing
+              // the isHighlighted prop to false on all platforms except iOS.
+              setHighlighted(
+                (suppressHighlighting == null || !suppressHighlighting) &&
+                  Platform.OS === 'ios',
+              );
               onPressIn?.(event);
             },
             onPressOut(event: PressEvent) {