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)
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