Update grafana-dashboards to v1.2.0

What does this MR do?

Update grafana-dashboards from v1.1.0 to v1.2.0 to support rails-app/registry and introduce improvements

• Diff: grafana-dashboards@v1.1.0...v1.2.0

Related issues

Closes #4724 (closed)

• Previous similar update: !3241 (merged)

Checklist

See Definition of done.

• Changelog entry created. Not applicable for Documentation changes and minor changes.
• Documentation created/updated
• Tests added
• Integration tests added to GitLab QA, if applicable
• MR targeting master branch
• MR has a green pipeline on GitLab.com
• Equivalent MR/issue for CNG opened if applicable
• trigger-package has a green pipeline running against latest commit

Reviewer Checklist

In addition to above, reviewer must:

• Pipeline is green on dev.gitlab.org if the change is not touching documentation or internal cookbooks