Add author link to the Jira issue entity
What does this MR do?
We are adjusting the Jira issues page #223917 (closed). After the feedback about how to handle external links #227099 (comment 375250321), we are adding the Jira author profile link, to go directly to their Jira profile.
This is the backend part to support the work in the frontend.
Related to #223918 (closed), #224596 (closed)