Add ~"1st contribution" if it is for community contribution

Dry-run:

• https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/593146946
• Latest dry-run: https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/598047539

It found gitlab-org/gitlab!34439 (closed) which is correct!

Action items

• Release a new version for https://gitlab.com/gitlab-org/gitlab-triage/-/merge_requests/157 => https://gitlab.com/gitlab-org/gitlab-triage/-/merge_requests/159
• (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