sprinter/jira_mirroring: recurring tickets
Today, once a GitLab issue is created we add a line with
"Jira: <permalink>" to the description. On our recurring issues that link
was being cloned to the duplicate, which would gain its own "Jira:" line,
hence causing a long chain of "Jira:" lines in any recurring issue.
Jira: [CKI-7022](https://issues.redhat.com/browse/CKI-7022)
task