Add Root Cause to Linked Jira Tickets

### Problem Statement

What I would really love to see is the AI used to help create better tickets in Jira. Right now when I have Sentry create a Jira ticket it usually just dumps the stack trace into the description, but if the AI could use the root cause that it found to write up a meaningful description for the Jira ticket that would be amazing

### Solution Brainstorm

The data already seems to be there just a mtter of adding that to the linked Jira ticket.

### Product Area

Issues

The issue names the Jira-linking workflow and the Issues product area, but provides no file, test, or entry point. Begin by locating the existing Sentry-to-Jira ticket creation path and how the AI root-cause result is represented. Done means linked Jira tickets use that root cause in a meaningful description, with coverage for the behavior.

Written by the indexing model from the issue text.