Jira Development Panel: add reviewer information

What does this MR do and why?

As per issue we're missing the reviewer's information on Jira Development Panel. This MR is solving this problem, but passing the additional information to the Jira's SyncService.

Screenshots or screen recordings

Before	After

How to set up and validate locally

note: use GitPod for testing this functionality ‼

1. Run the project using GitPot
2. Checkout the bmarjanovic/jira-development-panel-missing-reviewer-information branch
3. Install and configure the GitLab for Jira app per docs
4. Create an MR in a project linking a Jira issue:
   • add issue key to MR's title or description
   • select a reviewer whose email matches a Jira user
5. Verify that reviewers are being updated on the Jira Development panel 🎉

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #364273 (closed)