notif test: add a delay to allow registerToken to finish

Author: AhmedTareek

test/api/core_test.dart

@@ -460,7 +460,7 @@ void main() {
       });
     }
 
-    const packageInfo = PackageInfo(version: '0.0.1', buildNumber: '1');
+    const packageInfo = PackageInfo(version: '0.0.1', buildNumber: '1', packageName: 'com.zulip.flutter');
 
     const testCases = [
       ('ZulipFlutter/0.0.1+1 (Android 14)',             AndroidDeviceInfo(release: '14', sdkInt: 34),                      ),

test/model/store_test.dart

@@ -1177,6 +1177,7 @@ void main() {
       // When the token later appears, send it.
       connection.prepare(json: {});
       await startFuture;
+      await Future<void>.delayed(Duration(seconds: 2));
       if (defaultTargetPlatform == TargetPlatform.android) {
         checkLastRequestFcm(token: '012abc');
       } else {