Refactor, simplify and unify helpers for rendering markup
Created by: jirutka
This PR is closely related to #9288. I’m sending it separately to avoid unnecessary delays with reviewing and merging #9288.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Created by: jirutka
This PR is closely related to #9288. I’m sending it separately to avoid unnecessary delays with reviewing and merging #9288.