Action with setVariable and sensitive=true still requires mute=true to suppress stdout

[ldgriswold]

Describe what should be investigated or refactored

As described in the zarf documentation https://docs.zarf.dev/ref/actions/, mute is the correct field to set to suppress stdout. However, the documentation in the https://docs.zarf.dev/ref/actions/#action-transformations has an example where sensitive: true is set WITHOUT setting mute: true. This results in the stdout being displayed in the logs of something like a GitLab runner and potentially exposing secrets.

Additional context

The https://github.com/zarf-dev/zarf/blob/main/examples/component-actions/zarf.yaml#L128-L131 example does document how this should be done, but it might be as simple as updating the docs, or forcing mute: true when sensitive: true is set.