Fixing exposing ReactDelegate through ReactActivity for reload() (react#44227)

Summary:
Pull Request resolved: react#44227

In react#44223 kudo identified the incorrect return type.

Reviewed By: christophpurrer, philIip

Differential Revision: D56497700

fbshipit-source-id: 5d7fc7ef21c3d3033a2567eba51b613eb41f0a1a

Author: arushikesarwani94

packages/react-native/ReactAndroid/api/ReactAndroid.api

@@ -93,7 +93,7 @@ public abstract class com/facebook/react/ReactActivity : androidx/appcompat/app/
 	protected fun createReactActivityDelegate ()Lcom/facebook/react/ReactActivityDelegate;
 	protected fun getMainComponentName ()Ljava/lang/String;
 	public fun getReactActivityDelegate ()Lcom/facebook/react/ReactActivityDelegate;
-	public fun getReactDelegate ()V
+	public fun getReactDelegate ()Lcom/facebook/react/ReactDelegate;
 	protected final fun getReactInstanceManager ()Lcom/facebook/react/ReactInstanceManager;
 	protected final fun getReactNativeHost ()Lcom/facebook/react/ReactNativeHost;
 	public fun invokeDefaultOnBackPressed ()V

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

@@ -65,8 +65,8 @@ protected void onDestroy() {
     mDelegate.onDestroy();
   }
 
-  public void getReactDelegate() {
-    mDelegate.getReactDelegate();
+  public @Nullable ReactDelegate getReactDelegate() {
+    return mDelegate.getReactDelegate();
   }
 
   public ReactActivityDelegate getReactActivityDelegate() {