relates to #12907 implement adding an enroll secret when creating a new team with `fleetctl apply` if none is provided. - [x] Changes file added for user-visible changes in `changes/` or `orbit/changes/`. See [Changes files](https://fleetdm.com/docs/contributing/committing-changes#changes-files) for more information. - [ ] Added/updated tests - [x] Manual QA for all new/changed functionality