Triage: assign CI/CD label to scheduled issues
Sometimes we forget to add ~"CI/CD" label to runner issues, this triage policy will label all the opened issues already labeled with Deliverable or Stretch.
This strong labeling may help us, as a team, to safely use group board without the fear of losing some issue.
This MR requires gitlab-org/gitlab-triage!28 to be merged first.
Note: I added some dry-run and debug jobs that may help to detect policies issues before running the scheduled pipeline.
/cc: @bikebilly @rymai