Can't DROP 'packages_size'; check that column/key exists

Looks like it started here: https://gitlab.com/gitlab-org/gitlab-ee/commit/7b99577da3962769ac27682fd29b7345f88d35c0/pipelines?ref=master

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/27373/diffs https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/11020/diffs

Looks like CE MR got merged while EE one is not.

cc @abrandl @nolith