Revert "Remove unused option in server API"

pkg/analysis_server/test/source/test_all.dart

Index: pkg/analysis_server/test/source/test_all.dart
diff --git a/pkg/analyzer/test/instrumentation/test_all.dart b/pkg/analysis_server/test/source/test_all.dart
similarity index 53%
copy from pkg/analyzer/test/instrumentation/test_all.dart
copy to pkg/analysis_server/test/source/test_all.dart
index 46bb206436be2740d528378973b26b0f46ad9da6..1389dd310eb035123bee581fa0d62e75decd2766 100644
--- a/pkg/analyzer/test/instrumentation/test_all.dart
+++ b/pkg/analysis_server/test/source/test_all.dart
@@ -2,16 +2,13 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library analyzer.test.instrumentation.test_all;
+library test.source;
 
-import 'package:unittest/unittest.dart';
-
-import 'instrumentation_test.dart' as instrumentation_test;
+import '../utils.dart';
+import 'caching_put_package_map_provider_test.dart' as caching_provider_test;
 
 /// Utility for manually running all tests.
 main() {
-  groupSep = ' | ';
-  group('instrumentation', () {
-    instrumentation_test.main();
-  });
+  initializeTestEnvironment();
+  caching_provider_test.main();
 }