[TASK] Remove unused code from PageLayoutView

Until TYPO3 v9, PageLayoutView was a subclass of AbstractDatabaseRecordList,
so it inherited a lot of logic, which was never used in this class.

The code can safely be removed, as PageLayoutView is only used
in Page Module (web_layout) and Info Module ("Page Information").

Resolves: #90246
Releases: master
Change-Id: Ie1fbd1fb2131d1b7d6dee9342a82f54c4dd5e563
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63069


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>