[!!!][TASK] Remove TS option page.stylesheet

Remove the TypoScript option 'page.stylesheet' in favor of
using `page.includeCSS`.

Resolves: #82915
Releases: master
Change-Id: If8bb68a1520c23096ab0729caba681031c6a5401
Reviewed-on: https://review.typo3.org/54549


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>