[TASK] gitlab-ci: Reduce job timeout

Jobs are sometimes stuck, for instance when they run
into infinite loops. With the default job timeout of
one hour and a default retry, it takes two hours until
those report negative.
Jobs are usually done in less than 15 minutes. We now
set the timeout to generous 30 minutes, a pipeline with
a stuck job will thus report after one hour, latest.

Resolves: #94033
Related: #94001
Releases: master, 10.4, 9.5
Change-Id: I80c26783f5ff0a5900c849d84f57c77e22ca4f63
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68954


Tested-by: core-ci <typo3@b13.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>