UI: Add "New X" buttons to dashboard and group issue, MR and milestone indexes
To do
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Use searchable dropdown since dashboard/group can have a lot of projects. Use select2?
Before
After
As you can see, for milestones, groups are listed as well as we can now easily create group milestones.
Fixes #3544 (closed) and https://dev.gitlab.org/gitlab/gitlabhq/issues/2581