[TASK] Remove unused property in PageRepository

The public property $versioningPreview_where_hid_del
is not in use anymore due to the refactoring of
Doctrine DBAL and can be removed, as it is always
empty and not used in the TYPO3 Core.

Resolves: #79119
Releases: master
Change-Id: Ibf68917dd0ca34c2dd114ab7331d6c5a7611863c
Reviewed-on: https://review.typo3.org/51063


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>