Add mentioned users to the issue participants list

Your issue comments mention collaborators but aren't added to the participants field, leaving stakeholders untracked. Managers gain full context so triage happens same day.

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Overview

Mentions in issue comments frequently fail to surface stakeholders, causing missed notifications and slow triage; this flow captures mentioned accounts and updates the issue participants field so managers and on-call engineers see full context within minutes. That reduces manual lookup and speeds triage same day.