Consider a rubocop to enforce fully-qualified constants in ee/ directory
As https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/5644 shows, sometimes Ruby's name lookup does unexpected things that can bite us.
We should consider a rubocop that will complain for any non-fully-qualified constants in the ee/
directory.
For example, if working on EE::Epics
, the Issuable
constant should be written as ::Issuable
. The EE::Issuable
constant as EE::Issuable
, etc.