Pretty-print the helm upgrade command in job

What does this MR do and why?

I was tired of doing vscode magic to be able to see what helm command we used to deploy review apps.

Screenshots or screen recordings

Before

https://gitlab.com/gitlab-org/gitlab/-/jobs/3262203616#L117

After

https://gitlab.com/gitlab-org/gitlab/-/jobs/3317494647#L113

MR acceptance checklist

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

• I have evaluated the MR acceptance checklist for this MR.