[TASK] Introduce functional test for RequestBuilder

The now introduced functional tests are a replacement
for the unit tests which were only possible by mocking
the hell out of the RequestBuilder.

Releases: master
Resolves: #89898
Change-Id: Iccbd768ab0842e29d4954755e8f34f62bdc564f1
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62580


Tested-by: Michael Telgkamp <michael.telgkamp@mindscreen.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Michael Telgkamp <michael.telgkamp@mindscreen.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>