[TASK] DatabaseRecordList: Drop property `pageRecord`

The information about the page record is only needed in the
`addPageIdConstraint` method. The information is now collected there and
the property `pageRecord` has been removed.

Releases: master
Resolves: #92116
Change-Id: I3f96f52b58441e85d60a2bc4d70a9bc5ff9f4d5e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65492


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>