[TASK] Avoid $this->request in LinkValidatorController

$request is hand around already. There is no
reason to assign it to $this.

Resolves: #104467
Releases: main
Change-Id: I27ab48eaafaec3f78f98ff627034f19a8ad33fb6
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85342


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Andreas Nedbal <andy@pixelde.su>
Reviewed-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: Andreas Nedbal <andy@pixelde.su>
Tested-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>