2195 [android_intent] Cleanup the V2 migration

2196 [webview_flutter] (Trivial) Add V2 warnings

2200 [flutter_webview] Revert v2 embedder support

2204 [url_launcher] Re-land v2 embedding support

2209 [webview_flutter] Re-land support v2 embedding support

2226 [video_player] Add v2 embedding support

2241 [Shared_preferences]suppress warnings

2284 [path_provider] Add v2 embedding support for

2327 [android_alarm_manager] Update minimum Flutter version to 1.12.0

43461 Fixed usage of optional types in swift integration test.