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
Use strings for the ApplicationSetting properties:
- restricted_visibility_levels
- default_project_visibility
- default_snippet_visibility
- default_group_visibility
