[TASK] Turn ActionControllerTest into functionals

Avoids phpunit 10 deprecation and failures
and allows minor modifications of ActionController.

Resolves: #100400
Related: #100249
Releases: main
Change-Id: I4b39af2c326bb1c5c9b0df74c7c8e85c48f32ad4
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78373


Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>