Show issues of subgroups in group-level issue board
- In the current implementation of group issue boards (https://gitlab.com/gitlab-org/gitlab-ee/issues/928), we only show issues across all projects of that group. - It would be vastly helpful to show issues of projects that belong to subgroups of that particular group. - We need to figure out and implement labels from ancestor groups before doing this one, to make it consistent, i.e. https://gitlab.com/groups/gitlab-org/-/epics/22 - We should also maintain API consistency for this issue too. Consider: - group-a/group-aa/group-aaa/project-1 - group-a/group-aa/group-aab/project-2 - group-a/group-aa/group-aac/project-3 - group-a/group-ab/group-aba/project-4 - group-a/group-ac/project-5 - group-a/project-6 A group board for group-a should contain all issues in all project-1, project-2, project-3, project-4, project-5, project-6. A group board for group-aa should contain all issues in all project-1, project-2, project-3. **Issue board card path:** ![image](https://gitlab.com/gitlab-org/gitlab-ce/uploads/04ae656ca9365a08d96d5aa1148b6385/image.png)
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