[TASK] Convert AbstractUserAuthentication unit test to functional

Resolves: #98758
Releases: main
Change-Id: I777732e76c1182d6453aea52221054cc31d0f833
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76694


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>