Add milestone indicator to issue board cards
Problem
Currently when there is no milestone selected as a filter, there is no way of knowing which milestone that issue has or hasn't, unless you select it and open the sidebar.
Proposal
With the introduction of https://gitlab.com/gitlab-org/gitlab-ee/issues/4006 there will be a weight indicator, let's have that for milestones as well.
Edited by Dimitrie Hoekstra