Delete review-app k8s namespaces based on name, not its content
What does this MR do and why?
Closes https://gitlab.com/gitlab-org/quality/engineering-productivity-infrastructure/-/issues/79.
See RCA for context: https://gitlab.com/gitlab-org/quality/engineering-productivity-infrastructure/-/issues/79#note_1266577267
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.