Add artifacts management feedback banner

What does this MR do and why?

For #381491 (closed)

This page is behind the artifacts_management_page feature flag.

This MR adds a banner to the artifacts management page encouraging users to give us feedback on how it could better serve them.

Screenshots or screen recordings

How to set up and validate locally

1. echo "Feature.enable(:artifacts_management_page)" | bundle exec rails console
2. git checkout 381491-add-feedback-banner-to-artifacts-management-page
3. navigate to a project, and in the sidebar select CI/CD => Artifacts
4. find the feedback banner on the page

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.