UserListener: use event_listener instead of subscriber

[Hanmac]

Subject

I am targeting this branch, because it should be without BC break?

Closes #1650.

Changelog

### Fixed
- Deprecation of Event Subscribers on Symfony 6.3. The UserListener now uses Event Listeners

From Coverage testing, it seems that current phpunit test doesn't check the same for ODM too. Do we need more Unit tests, that explicit test ODM?

• doctrine.orm.entity_listener would be more specific for ORM, but it seems something like that doesn't exist for ODM.

[jordisala1991]

Thanks @Hanmac