uploads: add data attributes to thumbnail html.

Add data attributes to thumbnails on the /uploads, /upload_media_assets,
and /media_assets pages. Add a `data-is-posted` attribute for styling
thumbnails based on whether they've already been posted.

app/logical/table_builder.rb

@@ -119,7 +119,7 @@ class TableBuilder
     {
       id: "#{item.model_name.singular.dasherize}-#{item.id}",
       **row_attributes,
-      **ApplicationController.helpers.data_attributes_for(item, "data", item.html_data_attributes)
+      **ApplicationController.helpers.data_attributes_for(item)
     }
   end
 end