Fix duplicate mech footstep sounds (#12972)

* Fix duplicate mech footstep sounds

We just add a new component for relay targets so we can use that for audio prediction.

* Fix cwash

* woop

Content.Client/Physics/Controllers/MoverController.cs

@@ -140,7 +140,7 @@ namespace Content.Client.Physics.Controllers
 
         protected override bool CanSound()
         {
-            return _timing.IsFirstTimePredicted && _timing.InSimulation;
+            return _timing is { IsFirstTimePredicted: true, InSimulation: true };
         }
     }
 }