[TASK] Remove unused functionality of PageLayoutView class

A lot of code within PageLayoutView is not properly applicable
anymore.

The next step in this area is to:
- Extract Logic for PageInformationController into a separate class
- Extract Helper logic for custom content element previews into a separate class

Resolves: #90272
Releases: master
Change-Id: Ied94677c3a957eb81d18f281afab658c55214b48
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63097


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>