[TASK] gitlab-ci: Merge 'early' state into 'main'

Casual "pre-merge" patches (pushing a patch) to CI
gives us two stages: An "early" stage checking CGL
and composer basics, plus the "main" stage checking
everything else.

The goal with this approach is to return early on
simple errors like CGL violations without wasting
additional ressources on other things when those
pre-conditions fail.

In practice, an early "cgl broken" pipeline shadowes
possible further issues and extends runtime of
single builds since 'main' is only run after 'early'
has been successful.

The patch merges all "pre-merge" jobs into one
stage. This means more jobs are executed in parallel,
but we hope the infrastructure can cope with that.
If that works out, CI should answer more quickly
on single patches.

Resolves: #96841
Releases: main, 11.5
Change-Id: I986992f486b05845621f35228ae01b673368ba95
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73436


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