4406 Fix order-dependant platform interface tests (cla: yes, waiting for tree to go green, p: file_selector, p: google_maps_flutter, p: google_sign_in, p: url_launcher, p: video_player, p: quick_actions)

4407 [webview_flutter] Adjust test URLs again (cla: yes, waiting for tree to go green, p: webview_flutter, platform-android)

4408 [image_picker][android] suppress unchecked warning (cla: yes, waiting for tree to go green, p: image_picker, platform-android)

4413 [flutter_plugin_android_lifecycle] remove placeholder dart file (cla: yes, waiting for tree to go green, p: flutter_plugin_android_lifecycle)