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

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

+import 'package:path/path.dart' as p;
+import '../../../lib/src/io.dart';
+import '../../descriptor.dart' as d;
+import '../../test_pub.dart';
+main() {
+  initConfig();
+  integration('activates a package at a local path', () {
+    d.dir(
+        "foo",
+        [
+            d.libPubspec("foo", "1.0.0"),
+            d.dir("bin", [d.file("foo.dart", "main() => print('ok');")])]).create();
+    var path = canonicalize(p.join(sandboxDir, "foo"));
+    schedulePub(
+        args: ["global", "activate", "--source", "path", "../foo"],
+        output: 'Activated foo 1.0.0 at path "$path".');
+  });
+}