BUG: For Upcoming events/webinars and News, consider Plone field "publishing date"

I propose to use it only in 2 lists: "Upcoming events and webinars" and "News"

Implementing this issue for all the content types that we have would require to test all the views where they appear. Also note that allowing editors to use the publication date and expiration date slows down the DB search performed to fetch the results of the list where the contents appear. So the less the better.