Add `Deleted` status

[hoanhan101]

Sometimes a customer might want to delete a Virtual Circuit but we don't want to delete it immediately in our database yet. What we can do instead is to mark it Deleted and manually delete it later.

[marcoceppi]

I think either deleted or removed as a status would work. Alternatively, since "deleted" is just having the record removed, we could move from pending deletion to pending deactivation and deactivated as statuses which might better represent what's happening same with provisioning / de-provisioning / deprovisioned