[BUGFIX] Allow non-valid absolute paths for createVersionNumberFileName

With the fix of using versioned numbered filenames for the
TYPO3 Backend, a use-case "absolutely referenced, but
relative to public path file" did break for Frontend
inclusions of CSS or JS files.

This is now overcome by only using the original bugfix in the TYPO3
Backend.

Resolves: #98106
Related: #97939
Releases: main, 11.5, 10.4
Change-Id: Iff6251bd95e1c0a93a6f5538b9f560e55ba80b0c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75368


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