This change reflects the master branch to be targeted to v11.

Testing framework is raised as well to support v11.

This also means that all bugfixes now need to target "master, 10.4"
or "master, 10.4, 9.5" for critical bugfixes.

All features go into master branch again.

Resolves: #91469
Releases: master
Change-Id: Ife0f9d0fcf5ff13d55acb89dee5138e0e0b781e9
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64573


Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>