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

sdk/lib/_internal/pub_generated/test/global/activate/removes_old_lockfile_test.dart

+import 'package:scheduled_test/scheduled_test.dart';
+import '../../descriptor.dart' as d;
+import '../../test_pub.dart';
+main() {
+  initConfig();
+  integration('removes the 1.6-style lockfile', () {
+    servePackages((builder) {
+      builder.serve("foo", "1.0.0");
+    });
+    d.dir(
+        cachePath,
+        [
+            d.dir(
+                'global_packages',
+                [
+                    d.file(
+                        'foo.lock',
+                        'packages: {foo: {description: foo, source: hosted, '
+                            'version: "1.0.0"}}}')])]).create();
+    schedulePub(args: ["global", "activate", "foo"]);
+    d.dir(
+        cachePath,
+        [
+            d.dir(
+                'global_packages',
+                [
+                    d.nothing('foo.lock'),
+                    d.dir('foo', [d.matcherFile('pubspec.lock', contains('1.0.0'))])])]).validate();
+  });
+}