[BUGFIX] Consider CGI wrapper for NormalizedParams->getSiteUrl()

When using a CGI wrapper to dispatch the PHP process `ORIG_SCRIPT_NAME`
contains the name of the wrapper script (which is most probably outside
the TYPO3's project root) and leads to invalid prefixes, e.g. resolving
the `siteUrl` incorrectly as `http://ip10.local/fcgi/` instead of
actual `http://ip10.local/`.

Resolves: #89312
Releases: master, 9.5
Change-Id: Ib0732344deb0f2e71e06a4a1929bb712cd4f2239
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63602


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Riccardo De Contardi <erredeco@gmail.com>
Tested-by: Susanne Moog <look@susi.dev>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Benni Mack <benni@typo3.org>