TYPO3 Core

#96614 introduced a new way to load PageTSConfig. This is now out of sync with loading UserTSConfig.
This will probably lead to frustration in intragrator and developer side as they can't follow one approach for TSconfig but need to use the old one for UserTSconfig while there is a newer for PageTSconfig.

I would propose to streamline the loading and add the same way to User TS config as well before 12 LTS release.