cico: cancel job is new one was started
When we have jobs running for certain MR, we sometimes need to repush new changes. It's a good idea to cancel already running jobs to save resources. Message to gitlab that job is canceled is sent, too.
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
When we have jobs running for certain MR, we sometimes need to repush new changes. It's a good idea to cancel already running jobs to save resources. Message to gitlab that job is canceled is sent, too.