[leak-tracking] Add leak tracking in test/painting #2 (#136169)

packages/flutter/test/painting/continuous_rectangle_border_test.dart

@@ -9,6 +9,7 @@ library;
 
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
 
 void main() {
   test('ContinuousRectangleBorder defaults', () {
@@ -108,7 +109,7 @@ void main() {
     expect(border.getInnerPath(rect,textDirection: TextDirection.rtl), looksLikeRectRtl);
   });
 
-  testWidgets('Golden test even radii', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('Golden test even radii', (WidgetTester tester) async {
     await tester.pumpWidget(RepaintBoundary(
       child: Material(
         color: Colors.blueAccent[400],
@@ -126,7 +127,7 @@ void main() {
     );
   });
 
-  testWidgets('Golden test varying radii', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('Golden test varying radii', (WidgetTester tester) async {
     await tester.pumpWidget(RepaintBoundary(
       child: Material(
         color: Colors.green[100],
@@ -149,7 +150,7 @@ void main() {
     );
   });
 
-  testWidgets('Golden test topLeft radii', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('Golden test topLeft radii', (WidgetTester tester) async {
     await tester.pumpWidget(RepaintBoundary(
       child: Material(
         color: Colors.green[200],
@@ -169,7 +170,7 @@ void main() {
     );
   });
 
-  testWidgets('Golden test topRight radii', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('Golden test topRight radii', (WidgetTester tester) async {
     await tester.pumpWidget(RepaintBoundary(
       child: Material(
         color: Colors.green[300],
@@ -189,7 +190,7 @@ void main() {
     );
   });
 
-  testWidgets('Golden test bottomLeft radii', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('Golden test bottomLeft radii', (WidgetTester tester) async {
     await tester.pumpWidget(RepaintBoundary(
       child: Material(
         color: Colors.green[400],
@@ -209,7 +210,7 @@ void main() {
     );
   });
 
-  testWidgets('Golden test bottomRight radii', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('Golden test bottomRight radii', (WidgetTester tester) async {
     await tester.pumpWidget(RepaintBoundary(
       child: Material(
         color: Colors.green[500],
@@ -229,7 +230,7 @@ void main() {
     );
   });
 
-  testWidgets('Golden test large radii', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('Golden test large radii', (WidgetTester tester) async {
     await tester.pumpWidget(RepaintBoundary(
       child: Material(
         color: Colors.redAccent[400],