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/LightBehaviorSystem.cs

@@ -19,6 +19,9 @@ public sealed class LightBehaviorSystem : EntitySystem
 
     private void OnBehaviorAnimationCompleted(EntityUid uid, LightBehaviourComponent component, AnimationCompletedEvent args)
     {
+        if (!args.Finished)
+            return;
+
         var container = component.Animations.FirstOrDefault(x => x.FullKey == args.Key);
 
         if (container == null)