[!!!][TASK] Remove setting mod.web_layout.disableAdvanced

The TSconfig setting `mod.web_layout.disableAdvanced` has been used to disable
the "clear cache"-button in the page module.

Since this behaviour can be triggered through various other ways, like the
context menu or by just saving the page record, this feature is removed completely.

Resolves: #92837
Releases: master
Change-Id: Ie4c563d89280bc494265611924e2b02727aed644
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66631


Tested-by: Markus Klein <markus.klein@typo3.org>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>