Add test for policy_action_builder dropdown headerText
Description
This is a follow-up MR for !122044 (comment 1415766706)
suggestion (non-blocking): Even though this is a very trivial UI change, it can still go along way to update tests with static values. In some hypothetical scenario where
i18n.scannersHeaderText
moves around or becomes something more complex, it's always nice when there's tests around for this