Show Group Milestones issues like Project level issues.

Description

Group milestones views is useless compared to Project milestones. Having multiple projects working under the same group milestones makes the Milestones key to global followup of projects

As of today (10.0.1), this Milestones view for groups is empty

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Proposal

Consolidate issues (with project names) from all projects using the milestone, similar to the project milestone view.