fix: Prepares for IPooledEnumerable removal (#1548)

### Summary

- Removes `IPooledEnumerable` (non-generic)
- Changes `IPooledEnumerable<T>` so that  `Free()` is replaced with the `IDisposable` pattern

Projects/Server/TileMatrix/TileMatrix.cs

@@ -261,8 +261,6 @@ public class TileMatrix
                 m_TilesList.AddRange(multiTiles);
             }
 
-            eable.Free();
-
             if (!any)
             {
                 return tiles[x & 0x7][y & 0x7];