[!!!][FEATURE] Move BE Group Resolving into separate functionality

In order to re-use the group resolving, this logic
is now extract from AbstractUserAuthentication,
allowing to further optimize this code.

The hook $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_userauthgroup.php']['fetchGroups_postProcessing']
is removed and replaced by a PSR-14 event to modify the Group Data.

Resolves: #93056
Releases: master
Change-Id: If0fc7939e2617fae899474ba47ba786405e87a3c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/67034


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Benni Mack <benni@typo3.org>