Fix spawning glass shard for each glass sheet in stack (#25308)

* fix: SpawnEntitiesBehavior now works with stacks

Fixed the issue of SpawnEntitiesBehavior not executing multiple times on
entities with stack conponent.

Fixes #25287

* fix: reduced dictionary iterations

Content.Server/Destructible/Thresholds/Behaviors/SpawnEntitiesBehavior.cs

@@ -31,7 +31,15 @@ namespace Content.Server.Destructible.Thresholds.Behaviors
 
             var getRandomVector = () => new Vector2(system.Random.NextFloat(-Offset, Offset), system.Random.NextFloat(-Offset, Offset));
 
+            var executions = 1;
+            if (system.EntityManager.TryGetComponent<StackComponent>(owner, out var stack))
+            {
+                executions = stack.Count;
+            }
+
             foreach (var (entityId, minMax) in Spawn)
+            {
+                for (var execution = 0; execution < executions; execution++)
                 {
                     var count = minMax.Min >= minMax.Max
                         ? minMax.Min
@@ -57,6 +65,7 @@ namespace Content.Server.Destructible.Thresholds.Behaviors
                     }
                 }
             }
+        }
 
         public void TransferForensics(EntityUid spawned, DestructibleSystem system, EntityUid owner)
         {