Remove bogus C# finalizers (#28315)

Begging people to learn how this programming language works before throwing random syntax into a file.

None of these finalizers ever worked. I also checked whether they were memory leaks and needed *proper* shutdown logic, but they're all instantiated-once UI controls that last for the entire lifetime of the program so it's probably fine.

Content.Client/UserInterface/Systems/Actions/Controls/ActionButtonContainer.cs

@@ -119,9 +119,4 @@ public class ActionButtonContainer : GridContainer
                 yield return button;
         }
     }
-
-    ~ActionButtonContainer()
-    {
-        UserInterfaceManager.GetUIController<ActionUIController>().RemoveActionContainer();
-    }
 }