Add a ticket event when a Jira issue is unlinked from a Ticket

Today, when a Jira issue is linked to a Ticket, a ticket event is recorded, but when it’s unlinked there’s no corresponding “Jira unlinked” ticket event. This makes it hard to audit or track when the link was removed. Please add a ticket event that records the unlink action (who unlinked it and when), so the ticket history is complete.