In CRW-3102 and CRW-3135, the sources file was not deleted automatically from downstream.
This is because the sources file is part of the exclude list in
https://gitlab.cee.redhat.com/codeready-workspaces/crw-jenkins/-/blob/master/jobs/DS_CI/sync-to-downstream_3.x.jenkinsfile#L201-212
So, once we're all done with sources files, we should fix that rsync so it can delete sources from mid and downstream repos.