Refactor mind and ghost deletion code (#3680)

* Refactor mind and ghost deletion code

* Refactor to use EventBus and clean up deletes

* Fix mind eject when being deleted

* Refactor entity manager calls to use IEntity.EntityManager

Content.Server/Mobs/Mind.cs

@@ -313,6 +313,8 @@ namespace Content.Server.Mobs
             {
                 oldVisitingEnt.RemoveComponent<VisitingMindComponent>();
             }
+
+            oldVisitingEnt.EntityManager.EventBus.RaiseLocalEvent(oldVisitingEnt.Uid, new MindUnvisitedMessage());
         }
 
         public bool TryGetSession([NotNullWhen(true)] out IPlayerSession? session)