Move milestone while we add missed labels

Implementing #366 (closed)

• Also move the milestone when we're adding missed labels
• We move the milestones based on the current in progress milestones, regardless closing or not.
• Dry-run: https://gitlab.com/gitlab-org/quality/triage-ops/pipelines/109315603
  • For GitLab: https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/402921631
  • It correctly picked gitlab-org/gitlab#31031 (closed)
• Dry-run with BYPASSING_TRIAGE_FAKE_TODAY_FOR_MISSED_RESOURCES set to 2020-01-20
  • Pipeline: https://gitlab.com/gitlab-org/quality/triage-ops/pipelines/110216996
  • For GitLab: https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/406865833
• Dry-run with BYPASSING_TRIAGE_FAKE_TODAY_FOR_MISSED_RESOURCES set to 2020-01-21
  • Pipeline: https://gitlab.com/gitlab-org/quality/triage-ops/pipelines/110223717
  • For GitLab: https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/406898016