4580 Remove deprecated plugins (cla: yes, p: battery, p: android_alarm_manager, p: android_intent, p: image_picker, p: share, p: video_player, p: package_info, p: wifi_info_flutter, p: sensors, p: connectivity, p: device_info, platform-ios, platform-android, platform-macos, platform-web)

4588 [video_player] Eliminate platform channel from mock platform (waiting for tree to go green, p: video_player)

4589 [video_player] Remove test code from platform interface (p: video_player)