[TASK] Re-organize PageLayoutController

This change cleans up various parts of
PageLayoutController that are leftovers due to
the usage of PageLayoutView (which is now removed),
and Fluid-based Page module.

Resolves: #99193
Releases: main
Change-Id: I91d074502069680f7e5c95fbbeb23640fb469ddd
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76821


Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>