Work items - Support "Promote" within "Change type"

Background

In the initial release of work item issues, as we won't yet support group issues or project epics, we need to include a way to "promote" an issue to an epic while simultaneously changing the location to the parent group. This is different from other "Change type" actions because of the namespace change. In legacy issues this is accomplished as "Promote to Epic" or /promote. In work items, "Change type" will be the catchall workflow for changing between types.

Proposal

In the Change Type workflow, add an option for "Epic (Promote to group)". When selected, indicate that the item will be moved to the parent group. On submit, move and change type to Epic.

Acceptance criteria

• Type menu shows "Epic (Promote to group)"
• When Epic type is selected, help text shows Epic will be moved to parent group “GroupName”.
• When Change Type is submitted with Epic selected, item is "converted" to an Epic in the parent group (Actual details of clone/move should follow general work items clone/move pattern)
  • User taken to the Epic in the parent group following successful type change

Once group issues and/or project epics are available, the "Epic (Promote to group" option should be deprecated in favor of "Epic" with no promotion