Promote group labels

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• Promote group labels, similar to project label promotion.
• Only promote one step. I.e. you can only promote a group label to it's immediate parent.
• All your sibling groups are automatically merged and promoted.
• All epic objects in your group and their descendant groups have the new label.
• All epic objects in your sibling group and their descendant groups have the new label.
• All issues and merge requests your child projects and your descendent groups have the new label.

Example:

• Group A
  • Group B
    • Group C
      • Project X
      • Group D
    • Group E

Promotion:

• Suppose you are promoting a group label in C.
• All the existing group labels in C and in E are merged together and "promoted" into group B. (Behind the scenes, all those labels in group C and E with the same name are deleted.)
• If in group B, the new label already exists, proceed. Otherwise, create that new label.
• Look in Group C and all child/descendent objects. So this is all epics in C and its descendent groups. This is all issues/mrs in Project X and in Group D's descendent projects. Any of these objects that had the previously named label now are assigned this new label.
• Look in Group E and all child/descendent objects. All their epics/issues/mrs are assigned this new label if they previously had that same label name.