When sign-in is disabled:
- skip password expiration checks
- prevent password reset requests
- don’t show Password tab in User Settings
- don’t allow login with username/password for Git over HTTP requests
- render 404 on requests to Profiles::PasswordsController
If internal auth is disabled and user is not an LDAP user, present
the user with an alert to create a personal access token if he does
not have one already.
