[BUGFIX] Force scheme if forceAbsoluteUrl.scheme is set

Allow overriding the scheme with forceAbsoluteUrl even if the page
is not protected.

Also the case is now covered where a scheme of a full URL with a path
should be changed. The path in now correctly prepended by a slash.

Resolves: #90228
Releases: master, 10.4
Change-Id: I37592838a2026ad0bed0386e44caa7ffac1fb65e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63252


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