message: Add reference to RFC
diff: Scaffolder templates support anything that backstage.io and custom actions can do, so testing them is hard without actually running the instance of Backstage that they're designed for.
  +Please leave [feedback on the RFC](https://github.com/backstage/backstage/issues/14280) on your experience with this approach.
  +
  The [command line script](template-testing-dry-run.md) might offer a way for you to do so using the dry-run API used for the Template Editor. Run it against a running instance, either locally or remote, and use it like
  ```sh
  