[TASK] Replace prophecy in EXT:core Typo3DatabaseBackendTest

Also, a wrong call to flushByTag(s) is corrected.

Resolves: #98735
Releases: main
Change-Id: I3f6ecbf7570d6383fb836e81f15aea857efd2032
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76334


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>