Use the Helm `--atomic` flag when deploying Review Apps

Rémy Coutablerequested to merge
qa-use-tiller-2.14.2-for-review-apps into master

What does this MR do?

The atomic flag makes sure that resources are rolled-back if a deployment fails.

Requires gitlab-build-images!210 (merged) which updates Helm to 2.14.2.

Edited by Rémy Coutable

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