[TASK] Deprecate PageRepository->versioningWorkspaceId

The property does not need to be accessed from the outside anymore,
and can be marked as protected/deprecated, as this information is all
stored within the given context of the page repository.

Resolves: #85556
Releases: master
Change-Id: I36072c06b6ac5c5faa5ebce5b373e76530af7509
Reviewed-on: https://review.typo3.org/57592


Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>