4514 Enable Android integration tests in remaining plugins (cla: yes, waiting for tree to go green, p: camera, p: in_app_purchase, p: url_launcher, p: video_player, p: shared_preferences, platform-android)

4526 [shared_preferences] Publish fully federated version (cla: yes, p: shared_preferences)

4535 Update some plugins’ targetSdkVersions to 31 (cla: yes, p: path_provider, p: shared_preferences, platform-android, p: flutter_plugin_android_lifecycle, needs tests)

4596 [shared_preferences] Remove platform registration (waiting for tree to go green, p: shared_preferences, needs tests)