Do not load all users in updateAllUsers method

Looked into that and have some sugestions:

• We should add a method to the HelpdeskInterface to load all user ids (not user entities) with access to the helpdesk.
• That method could probably find all roles that have the permission access helpdesk, and then find all user ids from users, that have at least one of those roles and are active.
• All loops, that currently work with the $users array will have to load the user entity one by one as they will then only received the user id, not the user. This is the case in \Drupal\helpdesk_integration\PluginBase::updateAllUsers and in helpdesk_integration_batch_push_users

That's pretty cool. I like that you moved the loading method to the service.

Automatically closed - issue fixed for 2 weeks with no activity.