[TASK] Always use manually set canonical URL

If a canonical URL is set in the page properties, this will always be used
before checking the other options for defining the canonical URL.

Resolves: #94201
Releases: master
Change-Id: I200a086952cd70d0659692f144b2fae93173a8f4
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69271


Tested-by: Richard Haeser <richard@richardhaeser.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Riny van Tiggelen <info@online-gamer.nl>
Reviewed-by: Richard Haeser <richard@richardhaeser.com>
Reviewed-by: Riny van Tiggelen <info@online-gamer.nl>