[BUGFIX] Let DataHandler::getAutoVersionId return proper integer

With this change the method DataHandler::getAutoVersionId will return
null or a proper integer value to reduce the complexity at other places
to bring it in the right format.

Resolves: #91022
Releases: master
Change-Id: I3e05e7f31314bebcac5c5d47e88c381f85a399d3
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64160


Tested-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Benni Mack <benni@typo3.org>