[TASK] Extension manager: default sorting for Extensions

EM "Get Extension" does not show the awesome extension culture
that lives in the TER. Change sorting basically with the primary goal
to order extensions by update.

Resolves: #59583
Releases: 6.3, 6.2
Change-Id: Ie8aebc13c41427e0603fa5313b794996d01fbc44
Reviewed-on: https://review.typo3.org/30886
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters