[BUGFIX] Fix internal + external links with URLs fragment

Internal and external links have been incorrectly processed
by the legacy link notation converter which removed the
fragment from the URL before checking whether
the link is actually a legacy (file) link.

The change is now narrowed down to only append the fragment to
file links.

Resolves: #90916
Resolves: #91357
Related: #75213
Releases: master, 9.5
Change-Id: Ibdbfae4ac2ca0caa6710fb944810336e875e8929
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64411


Reviewed-by: Benjamin Franzke <bfr@qbus.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>