fix(dashboard): Replace react-nestable with new SortableTree component (#8599)

**What**
- Removes `react-nestable` dependency in favour of our own solution based on `@dnd-kit/core`

Resolves CC-217

packages/admin-next/dashboard/src/components/data-grid/data-grid-root/data-grid-root.tsx

@@ -732,7 +732,6 @@ export const DataGridRoot = <
       }
 
       if (e.key === "z" && (e.metaKey || e.ctrlKey)) {
-        console.log("Undo/Redo")
         handleUndo(e)
         return
       }