[TASK] Rename AbstractEnhancerSiteRequestTest

phpunit 10 expects classes that end with "Test"
to not be abstract.

Resolves: #100484
Related: #100249
Releases: main
Change-Id: Ifbcec828e56d781f8e2992b86cfd646372db1864
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78491


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