[TASK] Generate absolute FAL URLs in backend

With #93048 and #93048 every backend usage
of public FAL urls were touched and passed through
PathUtility::getAbsoluteWebPath()

This change introduces a different approach to
register an event listener in a backend middleware,
which makes all public URLs absolute.

With this, all PathUtility::getAbsoluteWebPath calls
for FAL assets became obsolete and are removed again.

Releases: master
Resolves: #95027
Related: #93226
Related: #93048
Change-Id: I7e2a6eb0b431e50dc430a5641b6fe810bd29f725
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70812


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Benni Mack <benni@typo3.org>