Run pipeline metrics seed on CI

What does this MR do and why?

Prevents breaking pipeline metrics seed by running it on CI.

How to set up and validate locally

Check if it ran correctly on CI, for example, https://gitlab.com/gitlab-org/gitlab/-/jobs/11796552918#L630

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.