Currently, the TYPO3 backend shows incomplete version information
regarding updates in the Core Updater and the reports. Both take
community-supported releases into account only and ignore the fact that
certain versions are covered by the ELTS program and thus render messages
about unsupported or invalid versions, which are false statements.

We now use the full information from get.typo3.org, and added lengthy
tests to avoid any further issues. The internally used
CoreVersionService is now able to handle ELTS releases as well and give
proper information to admins.

Resolves: #94745
Releases: master, 10.4, 9.5
Change-Id: I6485d36ded943acba723d55e23275554484e4f82
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70286


Tested-by: core-ci <typo3@b13.com>
Tested-by: Frank Nägler <frank.naegler@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Frank Nägler <frank.naegler@typo3.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>