[TASK] Make TcaSystemLanguageCollectorTest a functional

Create a functional test form the rather heavily
mocking unit test, and streamline.

Resolves: #98773
Releases: main
Change-Id: I9f2275394a2f644e8e707dc3218868dbbea63e06
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76609


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