Release rake task should fail when it finds to artifacts

Currently it logs the folowing and then passes:

No packages found for upload. Are artifacts available?
Job succeeded

See example here: https://dev.gitlab.org/gitlab/omnibus-gitlab/-/jobs/1362301

This impacted our 9.5.1 release. Where the Debian 8 build did not get fully released to the public at first.

cc\ @psimyn

cc\ @gitlab-build-team

changed the description

changed title from Release rake task should fail when it finds to artiricats to Release rake task should fail when it finds to artifacts

mentioned in issue #2717 (closed)

Root cause of why there were no artifacts is here https://gitlab.com/gitlab-org/omnibus-gitlab/issues/2717

mentioned in merge request !1891 (merged)

fixed by https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/1891

closed

assigned to @marin

changed milestone to %10.0