[TASK] Deprecate PageRepository->where_hid_del and where_groupAccess

PageRepository's public properties "where_hid_del" and "where_groupAccess"
which are used to modify a SQL query to fetch pages are now marked as protected,
thus not accessible anymore for outside usage.

Any usage will trigger a PHP deprecation notice.

Resolves: #99588
Releases: main
Change-Id: Ic8479e05dcaa72b4e9b7d5fbd3e56220dadd8f1e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77405


Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: core-ci <typo3@b13.com>