[BUGFIX] Omit warning when allowInconsistentLanguageHandling is active

In case mod.web_layout.allowInconsistentLanguageHandling is set,
no warnings about inconsistent language usage should be displayed.
This is now properly checked in ContentFetcher, which would
otherwise add a warning message to the queue.

Resolves: #99171
Releases: main, 12.4
Change-Id: If0f6cce36e5d35e0ec5ca3df865cc5736bb44005
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/79853


Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>