4371 [camera_web] Update usage documentation (cla: yes, p: camera, platform-web)

4396 [flutter_plugin_tools] Validate pubspec description (cla: yes, p: camera, p: file_selector, p: plugin_platform_interface, p: espresso, p: wifi_info_flutter)

4418 [camera] Add filter for unsupported cameras on Android (cla: yes, waiting for tree to go green, p: camera, platform-android)

4423 [camera] Fix CamcorderProfile Usages (cla: yes, waiting for tree to go green, p: camera, platform-android)

4426 [camera] Update [CameraOrientationTests testOrientationNotifications] unit test to work on Xcode 13 (cla: yes, waiting for tree to go green, p: camera, platform-ios)