Show actual dates within tooltips for Milestones in Epics sidebar
Summary
This issue is a follow-up on https://gitlab.com/gitlab-org/gitlab-ee/issues/6470. In Epic where added issues collectively can influence start and finish dates from Milestones, we need to show actual date for a given milestone under the tooltip. See this Slack conversation for more information.
Currently, it only shows the milestone titles.
Edited by Victor Wu