[BUGFIX] bamboo: Label parsing

The bamboo test setup relies on a funny solution to determine the
gerrit patch id and patch set, used for reporting results back
to gerrit.

The regex based solution started behaving weird with latest
bamboo versions and is now quoted slightly differently to fix that.

Special thanks to atlassian support for being friendly, helpful,
quick and providing a working solution to our issue.

Change-Id: I51ec85be2133033777fac8ff1f12071a81c71efc
Resolves: #83107
Releases: master, 8.7, 7.6
Reviewed-on: https://review.typo3.org/54774


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>