tests(firebase_database): add MacOS build & e2e CI stages
tests(firebase_database): add MacOS build & e2e CI stages

firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire