For #17700 improve error message when a custom profile is edited or uploaded with one that has the same name. updates the error message for `POST /fleet/mdm/profiles` and in fleetctl when using gitops - [x] Changes file added for user-visible changes in `changes/`, `orbit/changes/` or `ee/fleetd-chrome/changes`. See [Changes files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/Committing-Changes.md#changes-files) for more information. - [x] Added/updated automated tests - [x] Manual QA for all new/changed functionality