Include ancestor group labels in autocomplete

Fixes existing spec that wasn't testing what it was supposed to

ee/app/services/groups/autocomplete_service.rb

@@ -43,7 +43,7 @@ module Groups
     # rubocop: enable CodeReuse/ActiveRecord
 
     def labels_as_hash(target)
-      super(target, group_id: group.id, only_group_labels: true)
+      super(target, group_id: group.id, only_group_labels: true, include_ancestor_groups: true)
     end
 
     def commands(noteable)

ee/changelogs/unreleased/10706-quick-actions-on-epic-doesn-t-include-ancestor-group-labels.yml

+---
+title: Include ancestor group labels in autocomplete for epics
+merge_request: 15460
+author:
+type: fixed

ee/spec/services/groups/autocomplete_service_spec.rb

@@ -21,7 +21,7 @@ describe Groups::AutocompleteService do
     let!(:label1) { create(:group_label, group: group) }
     let!(:label2) { create(:group_label, group: group) }
     let!(:sub_group_label) { create(:group_label, group: sub_group) }
-    let!(:parent_group_label) { create(:group_label, group: group.parent, group_id: group.id) }
+    let!(:parent_group_label) { create(:group_label, group: group.parent) }
 
     it 'returns labels from own group and ancestor groups' do
       results = subject.labels_as_hash(nil)