Disable artifact validation for download action

What does this MR do?

Small before filter fix for https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/7827

What are the relevant issue numbers?

Related https://gitlab.com/gitlab-org/gitlab-ee/issues/7125

Does this MR meet the acceptance criteria?

• N/A Changelog entry added, if necessary
• N/A Documentation created/updated
• N/A Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• N/A Conforms to the database guides