Why have I recently started receiving emails from https://open.cdash.org/index.php?project=VTK&date=2021-04-22
You’ll get those if you have recently contributed to VTK. The intent is to alert folks if there are problems that their recent contributions may have caused. After a night (maybe two), you won’t get them anymore.
Login to what? Gitlab? I have never registered on CDash.
On CDash.org. I suspect it is a CDash project-level setting that is enabled that sends emails to recent committers about failing/passing tests. I’m not an admin for the project, so I can’t answer conclusively.