Draft: Add steps metrics

I could not get the test dashboard to work: https://dashboards.gitlab.net/dashboard/snapshot/oh9AHOIKY4LxFofgM7tqON2zHNEXASlv?var-environment=gprd&orgId=1&var-PROMETHEUS_DS=Mimir - Gitlab Gprd&var-stage=main - ci-runners: Business metrics

I tried the business metrics dashboard just because the test script required me to have an existing dashboard.

Closes Add step execution metrics to Runner Platform G... (gitlab-org/step-runner#435) • Unassigned