Do not expose Contact Numbers settings panel when no SMS support configured
Summary:
It's useless without SMS support and only exposed to the user themselves.
Closes T15486
Test Plan:
Before and after applying this patch,
* Try to access the list of your contact numbers at `/settings/panel/contact/`
* Try to access an existing, previously created contact number at `/auth/contact/1/`
* Try to add a contact number at `/auth/contact/edit/`
* Go to e.g. `/settings/panel/datetime` and check the "Authentication" section in the left sidebar for {nav icon=hashtag, name=Contact Numbers}
Reviewers: O1 Blessed Committers, speck
Reviewed By: O1 Blessed Committers, speck
Subscribers: speck, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Maniphest Tasks: T15486
Differential Revision: https://we.phorge.it/D25452