Use ECS prototype-reload events (#22613)

* Use ECS prototype-reload events

* better constructors

* Maybe this fixes tests?

Content.Shared/Entry/EntryPoint.cs

@@ -83,6 +83,9 @@ namespace Content.Shared.Entry
 
         private void PrototypeReload(PrototypesReloadedEventArgs obj)
         {
+            if (!obj.WasModified<ContentTileDefinition>())
+                return;
+
             // Need to re-allocate tiledefs due to how prototype reloads work
             foreach (var def in _prototypeManager.EnumeratePrototypes<ContentTileDefinition>())
             {