[TASK] Rename an abstract test case

Rename AbstractSoftReferenceParserTest to
AbstractSoftReferenceParserTestCase to prevent a
phpunit 10 warning that class names ending with
"Test" should not be abstract.

Resolves: #100316
Related: #100249
Releases: main
Change-Id: I85557a1cbda3ac96a1b9baad151cff160123819a
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78271


Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: Nikita Hovratov <nikita.h@live.de>