FEATURE: Allow group owners promote more owners (#19768)

This change allows group owners (in addition to admins) to promote other members to owners.

app/serializers/basic_group_serializer.rb

@@ -31,6 +31,7 @@ class BasicGroupSerializer < ApplicationSerializer
              :members_visibility_level,
              :can_see_members,
              :can_admin_group,
+             :can_edit_group,
              :publish_read_state
 
   def include_display_name?
@@ -73,6 +74,14 @@ class BasicGroupSerializer < ApplicationSerializer
     owner_group_ids.present?
   end
 
+  def can_edit_group
+    scope.can_edit_group?(object)
+  end
+
+  def include_can_edit_group?
+    scope.can_edit_group?(object)
+  end
+
   def can_admin_group
     scope.can_admin_group?(object)
   end