Draft: Add one off policy for group::certify

What does this MR do and why?

Describe in detail what your merge request does and why.

Related #1109 (closed)

• Adds dry-run job
• Adds one off policy to remove groupproduct planning from issues, mrs and epics with ~"group:certify"

Expected impact & dry-runs

These are strongly recommended to assist reviewers and reduce the time to merge your change.

See https://gitlab.com/gitlab-org/quality/triage-ops/-/tree/master/doc/scheduled#testing-with-a-dry-run on how to perform dry-runs.

Result

From dry run job https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/2996656254

From UI filtering

• 330 Issues
• 219 MRs
• 12 epics

Action items

• (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