HPCC-8816 Show 'Delete Query' result and redirect to QuerySet

After a query is deleted using the Delete button on QueryDetails page,
the QueryDetails page becomes invalid which should not be displayed.
This fix shows a pop up message indicating that Query has been deleted.
And the page will be redirected to Browse Queryset page.

Signed-off-by: Kevin Wang <kevin.wang@lexisnexis.com>