node: use `TempDir::close` in clone — heartwood

It was reported that on WSL after dropping TempDir there are still open file handles.

Attempt to close the TempDir and any open file handles, if possible – logging the error, if any.

         .into());
     }
     // N.b. Attempt to explicitly close the `TempDir`, since open file handles
     // causes issues on WSL
     let path = tmp.path().to_path_buf();
     if let Err(e) = tmp.close() {
         log::warn!(target: "worker", "Failed to cleanup temporary repository path {:?}: {e}", path);
     }
     Ok(())
 }