Ability to customize notification templates based on recipient

Issue

Currently there's no native process to customize the email templates based on the recipients interaction with a ticket. For example, both the reporter and request participant will receive the same notification look. The notification email also differs little for watchers.

Desired change

Have the ability to configure separate templates depending on who is receiving the email. It would be beneficial if there was a way to differentiate with a line such as You are receiving this email because you are watching issue ABC-123 to provide additional context and visual queues for users, especially in scenarios where they are added to tickets as part of automations.