3.38 / 3.10 (#2742)

This PR makes samples pass CI when 3.10 is released.

## Pre-launch Checklist

- [x] I read the [Flutter Style Guide] _recently_, and have followed its
advice.
- [x] I signed the [CLA].
- [x] I read the [Contributors Guide].
- [x] I have added sample code updates to the [changelog].
- [x] I updated/added relevant documentation (doc comments with `///`).

testing_app/integration_test/perf_test.dart

@@ -9,13 +9,11 @@ import 'package:testing_app/main.dart';
 
 void main() {
   group('Testing App Performance Tests', () {
-    final binding =
-        IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+    final binding = IntegrationTestWidgetsFlutterBinding.ensureInitialized();
 
     // The fullyLive frame policy simulates
     // the way Flutter responds to animations.
-    binding.framePolicy =
-        LiveTestWidgetsFlutterBindingFramePolicy.fullyLive;
+    binding.framePolicy = LiveTestWidgetsFlutterBindingFramePolicy.fullyLive;
 
     testWidgets('Scrolling test', (tester) async {
       await tester.pumpWidget(const TestingApp());

testing_app/lib/screens/favorites.dart

@@ -41,8 +41,7 @@ class FavoriteItemTile extends StatelessWidget {
       padding: const EdgeInsets.all(8.0),
       child: ListTile(
         leading: CircleAvatar(
-          backgroundColor:
-              Colors.primaries[itemNo % Colors.primaries.length],
+          backgroundColor: Colors.primaries[itemNo % Colors.primaries.length],
         ),
         title: Text('Item $itemNo', key: Key('favorites_text_$itemNo')),
         trailing: IconButton(

testing_app/lib/screens/home.dart

@@ -52,8 +52,7 @@ class ItemTile extends StatelessWidget {
       padding: const EdgeInsets.all(8.0),
       child: ListTile(
         leading: CircleAvatar(
-          backgroundColor:
-              Colors.primaries[itemNo % Colors.primaries.length],
+          backgroundColor: Colors.primaries[itemNo % Colors.primaries.length],
         ),
         title: Text('Item $itemNo', key: Key('text_$itemNo')),
         trailing: IconButton(

testing_app/test/favorites_test.dart

@@ -52,9 +52,7 @@ void main() {
       await tester.pumpAndSettle();
 
       // Get the total number of items available.
-      final totalItems = tester
-          .widgetList(find.byIcon(Icons.close))
-          .length;
+      final totalItems = tester.widgetList(find.byIcon(Icons.close)).length;
 
       // Remove one item.
       await tester.tap(find.byIcon(Icons.close).first);