Update font scale on Android when recreating RootView (#52595)

Summary:

Changelog: [ANDROID][FIXED] Update font scale when recreating `RootView`

At the moment `enableFontScaleChangesUpdatingLayout` flag only works when the activity is configured to handle font scale changes by itself (`configChanges="fontScale"` in the manifest).

When that configuration is missing, the OS handles the font scale changes by recreating the activity, but in this case the path responsible for updating internally kept font size isn't executed.

This diff updates the RootView, so that the display metrics are also updated when it's created. Alternative approach would be to do that on the Activity, but that assumes usage of `ReactActivity`.

Reviewed By: NickGerleman

Differential Revision: D78323174

Author: j-piasecki

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactRootView.java

@@ -135,6 +135,10 @@ public ReactRootView(Context context, AttributeSet attrs, int defStyle) {
   private void init() {
     setRootViewTag(ReactRootViewTagGenerator.getNextRootViewTag());
     setClipChildren(false);
+
+    if (ReactNativeFeatureFlags.enableFontScaleChangesUpdatingLayout()) {
+      DisplayMetricsHolder.initDisplayMetrics(getContext().getApplicationContext());
+    }
   }
 
   @Override