fix: Fixes container enumeration not recycling pooled arrays (#2341)

### Summary

Updates all calls to container.EnumerateItems() to properly dispose of the underlying PooledRefQueue so that we are properly recycling pooled arrays.

Projects/UOContent/Commands/Generic/Implementors/ContainedCommandImplementor.cs

@@ -67,7 +67,8 @@ namespace Server.Commands.Generic
 
                 var list = new List<object>();
 
-                foreach (var item in cont.EnumerateItems(true, ext.IsValid))
+                using var queue = cont.EnumerateItems(true, ext.IsValid);
+                foreach (var item in queue)
                 {
                     list.Add(item);
                 }