It's used in `UserManager` [here](https://github.com/tickit-project/tickit/blob/2c4cd1b63870bdf8d644bb6dabc485f32c512721/src/Tickit/Component/Entity/Manager/UserManager.php#L150). It's a bit unavoidable because it is dictated to by the `UserManagerInterface` in FOSUserBundle.

We could trigger a deprecated error and not provide that functionality?