Resolve "Investigate why some issues did not get section labels"

Dry-run: https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/708834563

This may add section label to 27821 issues.

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 => #g_qe_engineering_productivity, #product, #eng-managers
  • Week-in-review

Closes #537 (closed)