[BUGFIX] Extend settings ac tests to revert changes when done

Settings acceptence tests has been extended to revert
all changes done to the installer when the test finished.

On top of that the tests now verify the changed setting
by re-open the modal and compare the values.

Resolves: #94445
Releases: master
Change-Id: I94219db58cd624da2789e2cd5903a14f0091fd47
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69672


Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>