Either through sprinter.py or https://issues.redhat.com/browse/RIJ-1208, whichever comes first

The idea is that, at least when closing a ticket, we make sure there's a match for it in Jira with "External Issue URL" (`customfield_12317242`) pointing to the gitlab ticket url, with story point `weight` (`customfield_12310243`) defined.

AC:

• [x] Get a Jira token with write permission on https://issues.redhat.com/projects/CKI
• [x] Make sure there's a Jira ticket for every closed Gitlab Issue with "Title", "Story points" and a link back to Gitlab. And also a link in Gitlab pointing to Jira.
• [x] (Optional) sync Gitlab issues with Jira tickets on each update

Fields (Gitlab -> Jira):

• [x] Description (Markdown -> Rich text)
• [x] Weight -> Story Points
• [x] Link to Jira <-> Link to Gitlab
• [x] Assignee (mind that gitlab user != redhat email)
• [x] (Optional) Comments
• [x] (Optional, because we only care about closed tickets) Status