Leaks fix. (flutter#132778)

Fixes flutter#132769

Author: polina-c

packages/flutter/lib/src/material/menu_anchor.dart

@@ -303,6 +303,7 @@ class _MenuAnchorState extends State<MenuAnchor> {
     _anchorChildren.clear();
     _menuController._detach(this);
     _internalMenuController = null;
+    _menuScopeNode.dispose();
     super.dispose();
   }
 
@@ -551,6 +552,7 @@ class _MenuAnchorState extends State<MenuAnchor> {
     }
     _closeChildren(inDispose: inDispose);
     _overlayEntry?.remove();
+    _overlayEntry?.dispose();
     _overlayEntry = null;
     if (!inDispose) {
       // Notify that _childIsOpen changed state, but only if not

packages/flutter/lib/src/widgets/focus_manager.dart

@@ -1480,6 +1480,7 @@ class FocusManager with DiagnosticableTreeMixin, ChangeNotifier {
   @override
   void dispose() {
     _highlightManager.dispose();
+    rootScope.dispose();
     super.dispose();
   }
 

packages/flutter/test/material/menu_bar_theme_test.dart

@@ -2,10 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Fails with "flutter test --test-randomize-ordering-seed=20230817"
-@Tags(<String>['no-shuffle'])
-library;
-
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';

packages/flutter/test/material/menu_theme_test.dart

@@ -2,10 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Fails with "flutter test --test-randomize-ordering-seed=20230817"
-@Tags(<String>['no-shuffle'])
-library;
-
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';