[!!!][TASK] Remove group-related properties in BE_USER

The "$BE_USER->groupList" property is a comma-separated list
of userGroupUID, whereas "$BE_USER->includeGroupArray"
is a list of groups added to the includeGroupArray
which contains groups possibly added multiple times due
to recursion.

This is not needed, and therefore cleaned up,
the properties are removed.

Resolves: #93062
Releases: master
Change-Id: Ic358c1be56253acdbe3be4222196a074aab1e98c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/67099


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>