* Adds support for the "folders only" flag on retrieving siblings of a node. * Apply suggestions from code review Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * Updated test code. * Removed double secondary ordering by node Id and ensured we include this clause for all sort orders. * Ensure that ordering by node Id is always added only once and last, and only if it's not already been included in the order by clause. --------- Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>