[TASK] bamboo: Have cgl check in preparation stage

The cgl check is quick and fails rather often for pre-merge
test runs in the beginning. Move the job to preparation stage
for quicker test runs in those cases.

Change-Id: Id73f93212d12e47fb2897893c2ea518aa6900888
Resolves: #81683
Releases: master
Reviewed-on: https://review.typo3.org/53313


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>