Draft: Add migration policy for CI variables

What does this MR do and why?

Apply the following label migration as described in #1254 (closed)

Existing	New
CI variables grouppipeline authoring	CI variables grouppipeline security sectionops devopsverify

Expected impact & dry-runs

Job: https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/3908263998

Impacting 187 issues, 1 MR, 7 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