[TASK] Simplify rendering of ModuleTemplate with PageRenderer

PageRenderer does not need to care about the actual content.
Instead of re-running everything in PageRenderer, ModuleTemplate
only calls PageRenderer->render() once.

This simplifies the PageRenderer logic and adds a bit of performance
improvements.

Resolves: #91584
Releases: master
Change-Id: I2397f43a4e26f40bb885b21a67ae7a503349a614
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64735


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Frank Nägler <frank.naegler@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Frank Nägler <frank.naegler@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>