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

4540 [path_provider] Remove platform registration (cla: yes, p: path_provider, needs tests)

4547 [path_provider] Switch macOS to an internal method channel (cla: yes, p: path_provider, platform-macos)

4602 Match repo state to ignored files list (p: camera, p: google_maps_flutter, p: google_sign_in, p: image_picker, p: local_auth, p: path_provider, p: url_launcher, p: video_player, p: shared_preferences, platform-windows, platform-macos, platform-linux, needs tests)

4606 [path_provider] Fix handling of null application ID (p: path_provider, platform-linux)