Remove disposals compref (#19558)

This one was relatively painless.

Content.Shared/Disposal/SharedDisposalUnitSystem.cs

@@ -1,4 +1,5 @@
-using Content.Shared.Body.Components;
+using System.Diagnostics.CodeAnalysis;
+using Content.Shared.Body.Components;
 using Content.Shared.Disposal.Components;
 using Content.Shared.DoAfter;
 using Content.Shared.DragDrop;
@@ -34,6 +35,8 @@ public abstract class SharedDisposalUnitSystem : EntitySystem
     // Percentage
     public const float PressurePerSecond = 0.05f;
 
+    public abstract bool HasDisposals([NotNullWhen(true)] EntityUid? uid);
+
     /// <summary>
     /// Gets the current pressure state of a disposals unit.
     /// </summary>