More fixes for failures on the Windows bot

pkg/analyzer/test/src/task/test_all.dart

Index: pkg/analyzer/test/src/task/test_all.dart
diff --git a/pkg/analyzer/test/src/task/test_all.dart b/pkg/analyzer/test/src/task/test_all.dart
index 44d4eef58f877d58d94a407a759c226b2c6982ed..d5f5dfa8511a2d7b9fb57f05dfb60cb8ea081f9b 100644
--- a/pkg/analyzer/test/src/task/test_all.dart
+++ b/pkg/analyzer/test/src/task/test_all.dart
@@ -6,6 +6,7 @@ library test.src.task.test_all;
 
 import 'package:unittest/unittest.dart';
 
+import '../../utils.dart';
 import 'dart_test.dart' as dart_test;
 import 'dart_work_manager_test.dart' as dart_work_manager_test;
 import 'driver_test.dart' as driver_test;
@@ -20,7 +21,7 @@ import 'model_test.dart' as model_test;
 
 /// Utility for manually running all tests.
 main() {
-  groupSep = ' | ';
+  initializeTestEnvironment();
   group('task tests', () {
     dart_test.main();
     dart_work_manager_test.main();