[TASK] Disable new page module view when upgrading

To ensure maximum compatibility, we only enable the new page module
for new installations (or by manually enabling the feature flag) not for
upgrades.

Resolves: #91142
Releases: master

Change-Id: I90f75c3caf1dd7447e4e406ee55303694f8f327d
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64256


Reviewed-by: Josef Glatz <josefglatz@gmail.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Josef Glatz <josefglatz@gmail.com>
Tested-by: Benni Mack <benni@typo3.org>