[TASK] Avoid withConsecutive() in FrontendConfigurationManagerTest

Straight refactoring avoiding withConsecutive().

Resolves: #100421
Related: #100249
Releases: main
Change-Id: Iabd2dfbf32bc8066308a9eeb5126084bcf0363a2
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78392


Tested-by: Benni Mack <benni@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Benni Mack <benni@typo3.org>