[TASK] Deprecate -1 in language-related calls of PageRepository

The default value for
- PageRepository->getPageOverlay()
- PageRepository->getPagesOverlay()
should be "null" and not some magic "-1" usage.

Resolves: #85553
Releases: master
Change-Id: Ic665c4a563e6496678ab944c80901db26f2b72ba
Reviewed-on: https://review.typo3.org/57591


Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Mathias Brodala <mbrodala@pagemachine.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Daniel Gorges <daniel.gorges@b13.de>
Tested-by: Daniel Gorges <daniel.gorges@b13.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>