[TASK] Replace prophecy in EXT:core AuthenticationServiceTest

Resolves: #98759
Releases: main
Change-Id: I907e7f2d4958901205f6d9af517979aa61c5b9bc
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76695


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>