Show an alert note with the email participants that are subscribed to the issue in the comment area

This indicates who will be notified by email when a notification goes out.

Use feature flag service_desk_email_participants

Design

Additional context regarding design can be found in the epic description (solution heading): &3758

There has also been discussions regarding designs available in the original issue: #195525 (closed)Email_Participants_-Quick_Action-_Completed.png