Make `review-deploy` display some debug output when it fails

We recently caught a legitimate bug in the review-deploy job but that wasn't obvious what the cause was at first sight.

The issue was https://gitlab.com/gitlab-org/gitlab-ce/issues/62125.

We should make easier to understand what is the root cause of a failed deployment for instance by:

1. Displaying helm status at the end of the job
2. Displaying kubectl get pods --namespace<namespace> -l release=<release> at the end of the job
3. Displaying kubectl logs <pod> at the end of the job