Migrate group::certify to group::product planning

What does this MR do and why?

Migrate resources labeled with ~"group::certify" to groupproduct planning per request in #1253 (closed)

Expected impact & dry-runs

https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/3918319472

impacting

• 142 issues
• 8 MRs
• 30 epics

Action items

• If adding environment variables for reactive processors, update config/triage-web.yaml and .gitlab/ci/triage-web.yml
• (If applicable) Add documentation to the handbook pages for Triage Operations =>
• (If applicable) Identify the affected groups and how to communicate to them:
  • /cc @person_or_group =>
  • Relevant Slack channels =>
  • Engineering week-in-review