Add backfill feature for outPrice in all variants

Make a feature to make it possible to backfill outPrice in all variants. It should call openAI to extract the outPrice from the image / posttext. Also the "regular price" if possible. Then it should backfill AND calculate all the totalsales etc in the campaign. There should be a button for each store where we can do it. Or maybe we just do it for all as standard? Probably do it for all campaigns as standard.