For now, the only way to close a Testmanagement campaign is to update the related artifact on the artifact view and it's still possible to update the campaign and its tests.
In order to improve the management of closed campaigns:
- Add a way to identify closed campaign (✅ request #19723)
- make a campaign unusable if it is closed (✅ request #19723)
- Add a way to close/reopen campaign on the campaign view (dropdown)
- AD/TTM integration: when a release (or milestone) is closed, its campaigns should be automatically closed