Add Danger check for artifact setting changes in CI YAML files

What does this MR do and why?

This MR adds a Danger check to notify the MR author when artifact settings in CI YAML files are changed within MRs. It asks if restricting download access is necessary using the artifact:access keyword when the artifact contains sensitive data and should only be shared with project team members with a Developer+ role.

Closes #458482 (closed)

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Screenshots

I triggered this Danger check via 9983912a.

• danger-review job: https://gitlab.com/gitlab-org/gitlab/-/jobs/6729858551
• danger comment: !151110 (comment 1883359030)