4272 [camera] Fix a disposed camera controller throwing an exception when being replaced in the preview widget. (cla: yes, waiting for tree to go green, p: camera)

4273 [flutter_plugin_tools] Check ‘implements’ for unpublished plugins (cla: yes, waiting for tree to go green, p: camera, platform-web)

4274 Disable some flaky tests (cla: yes, p: webview_flutter, p: android_alarm_manager, p: video_player, platform-android)

4275 [flutter_plugin_tools] Remove support for bypassing, or prompting for, git tagging (cla: yes)

4276 [flutter_plugin_tool] Add support for running Windows unit tests (cla: yes)

4278 [camera_web] Add an initial device orientation event (cla: yes, waiting for tree to go green, p: camera, platform-web)