remove support for analyzer configuration in pubspec

pkg/analyzer/test/source/test_all.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // 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.source.test_all;
 
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'analysis_options_provider_test.dart' as analysis_options_provider_test;
-import 'config_test.dart' as config_test;
 import 'embedder_test.dart' as embedder_test;
 import 'error_processor_test.dart' as error_processor_test;
 import 'package_map_provider_test.dart' as package_map_provider_test;
 import 'package_map_resolver_test.dart' as package_map_resolver_test;
 import 'path_filter_test.dart' as path_filter_test;
 import 'sdk_ext_test.dart' as sdk_ext_test;
 
 /// Utility for manually running all tests.
 main() {
   defineReflectiveSuite(() {
     analysis_options_provider_test.main();
-    config_test.main();
     embedder_test.main();
     error_processor_test.main();
     package_map_provider_test.main();
     package_map_resolver_test.main();
     path_filter_test.main();
     sdk_ext_test.main();
   }, name: 'source');
 }