Store the async-await compiled pub code directly in the repo.

sdk/lib/_internal/pub_generated/test/global/activate/unknown_package_test.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.
-
 import 'package:scheduled_test/scheduled_test.dart';
-
 import '../../../lib/src/exit_codes.dart' as exit_codes;
 import '../../test_pub.dart';
-
 main() {
   initConfig();
   integration('errors if the package could not be found', () {
     serveNoPackages();
-
-    schedulePub(args: ["global", "activate", "foo"],
+    schedulePub(
+        args: ["global", "activate", "foo"],
         error: startsWith("Could not find package foo at"),
         exitCode: exit_codes.UNAVAILABLE);
   });
 }