Remove Helm based release environment QA

Dat Tangrequested to merge
dattang/remove-helm-release-env-qa into master

What does this MR do and why?

Remove Helm based release environment QA

The Helm based release environments don't work with GitLab chart for version 19.0 and above anymore. Thus, we are deprecating it. Together with that, we move from running QA on Helm-based env to GET-based env.

References

Ref: gitlab-com/gl-infra/delivery#21596 (closed)

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