Update product group to product_planning
What does this MR do and why?
In gitlab-com/www-gitlab-com@ee7208ef the group "certify" was renamed to "product_planning".
In a effort to keep the ownership data in the metric definitions up-to-date, this MR updates the metrics that had the 'certify' product group.
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
Related to &12587 (closed)