[TASK] Improve link validator ux

Add notification if actions were performed

Resolves: #77366
Releases: master
Change-Id: Id3e7cc8a541352a99c8ba639ce71ef28502114ed
Reviewed-on: https://review.typo3.org/49334


Tested-by: Bamboo TYPO3com <info@typo3.com>
Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>