Burndown chart for group milestone
- Similar to project milestone burndown charts, have a group milestone burndown chart.
- Should account for all issues within the group,
including all subgroups nesting down and their projects. That is, any issue with that group milestone should be included in this calculation of the burndown chart, and that means, all those issues could be in many subnested subgroups.
- This is not yet possible, since gitlab-ce#36862 (closed) is not implemented yet. Will consider that scope in that issue.
- So the only issues that the group milestone's burndown chart considers is the issues within the projects that are direct children of the given group.
Remove warning message during promotion: