Allow to sort wiki pages by date and title

Igor Drozdovrequested to merge
ee-id-51433-sort-wiki-by-date into master

What does this MR do?

It's a backport for CE version https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/25365

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/51433

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