[TASK] Add test for Filelist sorting function

The change https://review.typo3.org/c/Packages/TYPO3.CMS/+/78187
provided locale aware sorting for files.

This patch proves it by providing a test.

Resolves: #100263
Related: #100231
Related: #67187
Releases: main
Change-Id: I2b66ef683c4257cb6fba644baae18bb840721fd1
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78219


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