[Meta]: Port away from old emit mechanism

[CarlSchwan]

Context: there are currently three ways to do events in NC: using the legacy emmiter, using symfony event dispatcher and the new event dispatcher. Everything should be ported to the new way

Current pull requests:

• Start porting Admin audit to new events #32019
• Port files trashbin events to IEventDispatcher/IEventListener #32018
• Move admin_audit to proper event listeners v2 #47865

Possible sub-tasks:

• Port repair/updater away from emmiter
• Make OCP\IRootFolder not extends OC\Emiiter
• ...