Replaces AnchoredChanged C# event with ComponentMessage (#2905)

* Replaces AnchoredChanged C# event with ComponentMessage

* Removes unneeded fields

Co-authored-by: py01 <pyronetics01@gmail.com>

Content.Server/GameObjects/Components/Disposal/DisposalTubeComponent.cs

@@ -1,4 +1,4 @@
-#nullable enable
+#nullable enable
 using System;
 using System.Linq;
 using Content.Shared.GameObjects.Components.Disposal;
@@ -231,10 +231,6 @@ namespace Content.Server.GameObjects.Components.Disposal
 
             Contents = ContainerManagerComponent.Ensure<Container>(Name, Owner);
             Owner.EnsureComponent<AnchorableComponent>();
-
-            var physics = Owner.EnsureComponent<PhysicsComponent>();
-
-            physics.AnchoredChanged += AnchoredChanged;
         }
 
         protected override void Startup()
@@ -254,9 +250,6 @@ namespace Content.Server.GameObjects.Components.Disposal
         {
             base.OnRemove();
 
-            var physics = Owner.EnsureComponent<PhysicsComponent>();
-            physics.AnchoredChanged -= AnchoredChanged;
-
             Disconnect();
         }
 
@@ -275,6 +268,10 @@ namespace Content.Server.GameObjects.Components.Disposal
                     _lastClang = _gameTiming.CurTime;
                     EntitySystem.Get<AudioSystem>().PlayAtCoords(_clangSound, Owner.Transform.Coordinates);
                     break;
+
+                case AnchoredChangedMessage:
+                    AnchoredChanged();
+                    break;
             }
         }