[TASK] Update UC in recycler only once per action

The UC of a backend user is now updated only once per request, if there
are actual changes.

Resolves: #83839
Releases: master, 8.7
Change-Id: I859f8b2cc94b6254251ecf639222201cbf57f1ad
Reviewed-on: https://review.typo3.org/55641


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>