ci: Fix helm command to list across all namespaces and delete old environments

Rémy Coutablerequested to merge
fix-automated-cleanup into master

What does this MR do and why?

This fixes two issues:

  • The helm list command doesn't return any releases as it's not looking at all the namespaces: https://gitlab.com/gitlab-org/gitlab/-/jobs/3656724501
  • Environments aren't deleted anymore (only Helm releases and K8s namespaces) so we could leave some unused environments behind (not a big deal but it's not useful)

Example job: https://gitlab.com/gitlab-org/gitlab/-/jobs/3657883613

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Rémy Coutable

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