Related to #10121 this reverts #10107, and modifies the UI to use
`mdm.enabled_and_configured` instead of the `GET /mdm/apple` endpoint so
we don't face permissions issues and Maintainers are able to see the
Controls page.
More details and rationale in
https://github.com/fleetdm/fleet/issues/10121#issuecomment-1450335235
Tested with Admins, Maintainers and Observers