[TASK] Let all Commands return an int value

The parent class states an integer value is returned,
but most core commands did not follow that rule. Now they
got according return statements to fulfill that contract.

Resolves: #90652
Releases: master
Change-Id: I58ad434404ce3537a4eb7ae34b88884b6962047f
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63557


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Frank Nägler <frank.naegler@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Frank Nägler <frank.naegler@typo3.org>