FE for share groups with groups

What does this MR do?

#22986 (closed)

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• [-] Separation of EE specific content

Performance and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

spec/controllers/groups/group_members_controller_spec.rb

@@ -31,6 +31,12 @@
         expect(assigns(:invited_members).map(&:invite_email)).to match_array(invited.map(&:invite_email))
       end
 
+      it 'assigns skip groups' do
+        get :index, params: { group_id: group }
+
+        expect(assigns(:skip_groups)).to match_array(group.related_group_ids)
+      end
+
       it 'restricts search to one email' do
         get :index, params: { group_id: group, search_invited: invited.first.invite_email }