[TASK] Ensure tests for extensions work

This change makes some FE calls easier for testing
in extensions, such as EXT:solr.

Resolves: #96050
Releases: master, 11.5
Change-Id: I3482ac0abe4e813ff5cba795da9b730ee0efbdee
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72249


Tested-by: core-ci <typo3@b13.com>
Tested-by: Rafael Kähm <rafael.kaehm@dkd.de>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Rafael Kähm <rafael.kaehm@dkd.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Benni Mack <benni@typo3.org>