Fix animation looping bugs. (#29457)

Summary of the problem is in the corresponding engine commit: a4ea5a4620

This commit requires engine master right now.

I think #29144 is probably the most severe one, but I touched Jittering and RotatingLight too since they seemed sus too.

Fixes #29144

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Client/Light/EntitySystems/RotatingLightSystem.cs

@@ -69,6 +69,9 @@ public sealed class RotatingLightSystem : SharedRotatingLightSystem
 
     private void OnAnimationComplete(EntityUid uid, RotatingLightComponent comp, AnimationCompletedEvent args)
     {
+        if (!args.Finished)
+            return;
+
         PlayAnimation(uid, comp);
     }