4400 [google_maps_flutter] Clean Java test, consolidate Marker example. (cla: yes, waiting for tree to go green, p: google_maps_flutter, platform-android)

4401 [webview_flutter] Update webview platform interface with new methods for running JavaScript. (cla: yes, waiting for tree to go green, p: webview_flutter)

4405 [ci] Remove obsolete Dockerfile (cla: yes, waiting for tree to go green)

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)