[TASK] Convert EXT:extbase Typo3DbBackendTest to functional

Resolves: #98891
Releases: main
Change-Id: I69e15b139af7222b49353b0060ade35ca4aa87a3
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76814


Tested-by: core-ci <typo3@b13.com>
Tested-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>