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/GameTicking/GamePreset.cs

@@ -45,7 +45,6 @@ namespace Content.Server.GameTicking
             if (mind.VisitingEntity != null)
             {
                 mind.UnVisit();
-                mind.VisitingEntity.Delete();
             }
 
             var position = playerEntity?.Transform.Coordinates ?? IoCManager.Resolve<IGameTicker>().GetObserverSpawnPoint();