Updated ContainerHelpers to use new extensions (#2530)

Co-authored-by: David Tan <>

Content.Server/AI/Operators/Inventory/OpenStorageOperator.cs

@@ -25,7 +25,7 @@ namespace Content.Server.AI.Operators.Inventory
 
         public override Outcome Execute(float frameTime)
         {
-            if (!ContainerHelpers.TryGetContainer(_target, out var container))
+            if (!_target.TryGetContainer(out var container))
             {
                 return Outcome.Success;
             }

Content.Server/AI/Operators/Inventory/PickupEntityOperator.cs

@@ -25,7 +25,7 @@ namespace Content.Server.AI.Operators.Inventory
         {
             if (_target.Deleted ||
                 !_target.HasComponent<ItemComponent>() ||
-                ContainerHelpers.IsInContainer(_target) ||
+                _target.IsInContainer() ||
                 !_owner.InRangeUnobstructed(_target, popup: true))
             {
                 return Outcome.Failed;