Temporarily disable auto-labelling

Stops auto-labelling temporarily to unblock gitlab-com/www-gitlab-com!62755 (merged)

Relates to #571 (closed)

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 =>
  • Week-in-review