Toolkit: handle 404 errors gracefully on unpublish in circleci-release-next-packages.sh (#23417)
Toolkit: handle 404 errors gracefully on unpublish in circleci-release-next-packages.sh (#23417)

* handle 404 errors gracefully

* need to redirect stderr to stdout to check for 404s
grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana