[TASK] Remove deprecated genTreeStatus in DatabaseIntegrityCheck

Resolves: #56844
Releases: 6.2
Change-Id: Ic49eb279b8cc3df9da93a153b407e0f7dea0396f
Reviewed-on: https://review.typo3.org/28322
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer