[TASK] Consolidate CI permutations

With two PHP versions and various DB engines,
the pre-merge and nightly CI runs are consolidated
a bit to not test too many different permutations
but rather check lower and upper version flanks to
reduce number of test jobs.

Resolves: #99482
Releases: main
Change-Id: Ie0ee219e9263486f3ca703a9ce648edbbff30903
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77280


Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>