Migrate RNTester onto new RN notification callbacks

Summary:
## Changelog:

[iOS][Changed] Migrated RNTester/AppDelegate to the new notification callback

Differential Revision: D52883367

packages/rn-tester/RNTester/AppDelegate.mm

@@ -7,6 +7,8 @@
 
 #import "AppDelegate.h"
 
+#import <UserNotifications/UserNotifications.h>
+
 #import <React/RCTBundleURLProvider.h>
 #import <React/RCTDefines.h>
 #import <React/RCTLinkingManager.h>
@@ -22,6 +24,9 @@
 
 static NSString *kBundlePath = @"js/RNTesterApp.ios";
 
+@interface AppDelegate () <UNUserNotificationCenterDelegate>
+@end
+
 @implementation AppDelegate
 
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
@@ -31,6 +36,8 @@ - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(
   // They will be passed down to the ViewController used by React Native.
   self.initialProps = [self prepareInitialProps];
 
+  [[UNUserNotificationCenter currentNotificationCenter] setDelegate:self];
+
   return [super application:application didFinishLaunchingWithOptions:launchOptions];
 }
 
@@ -96,17 +103,26 @@ - (void)application:(__unused UIApplication *)application
   [RCTPushNotificationManager didFailToRegisterForRemoteNotificationsWithError:error];
 }
 
-// Required for the remoteNotificationReceived event.
-- (void)application:(__unused UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)notification
+#pragma mark - UNUserNotificationCenterDelegate
+
+// Required for the remoteNotificationReceived and localNotificationReceived events
+- (void)userNotificationCenter:(UNUserNotificationCenter *)center
+       willPresentNotification:(UNNotification *)notification
+         withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler
 {
-  [RCTPushNotificationManager didReceiveRemoteNotification:notification];
+  [RCTPushNotificationManager didReceiveNotification:notification];
+  completionHandler(UNNotificationPresentationOptionNone);
 }
 
-// Required for the localNotificationReceived event.
-- (void)application:(__unused UIApplication *)application
-    didReceiveLocalNotification:(UILocalNotification *)notification
+// Required for the remoteNotificationReceived and localNotificationReceived events
+// Called when a notification is tapped from background. (Foreground notification will not be shown per
+// the presentation option selected above.)
+- (void)userNotificationCenter:(UNUserNotificationCenter *)center
+    didReceiveNotificationResponse:(UNNotificationResponse *)response
+             withCompletionHandler:(void (^)(void))completionHandler
 {
-  [RCTPushNotificationManager didReceiveLocalNotification:notification];
+  [RCTPushNotificationManager didReceiveNotification:response.notification];
+  completionHandler();
 }
 
 #pragma mark - New Arch Enabled settings