[TASK] Doctrine: Migrate ext:backend/FrontendBackendUserAuthentication

Resolves: #77030
Releases: master
Change-Id: I51f4a171a8a2ff079413298b3fe8a8d48015759d
Reviewed-on: https://review.typo3.org/48909


Tested-by: Bamboo TYPO3com <info@typo3.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>