Add missing trailing commas (#28673)

* add trailing commas on list/map/parameters

* add trailing commas on Invocation with nb of arg>1

* add commas for widget containing widgets

* add trailing commas if instantiation contains trailing comma

* revert bad change

packages/flutter_tools/test/src/mocks.dart

diff --git a/packages/flutter_tools/test/src/mocks.dart b/packages/flutter_tools/test/src/mocks.dart
index 0150d4c..b440e3f 100644
--- a/packages/flutter_tools/test/src/mocks.dart
+++ b/packages/flutter_tools/test/src/mocks.dart
@@ -31,7 +31,7 @@
       id: 'io.flutter.android.mock',
       file: fs.file('/mock/path/to/android/SkyShell.apk'),
       versionCode: 1,
-      launchActivity: 'io.flutter.android.mock.MockActivity'
+      launchActivity: 'io.flutter.android.mock.MockActivity',
     ),
     iOS: BuildableIOSApp(MockIosProject())
   );
@@ -488,7 +488,7 @@
     List<String> typeDefinitions,
     String libraryUri,
     String klass,
-    bool isStatic
+    bool isStatic,
   ) async {
     return null;
   }