FIX: Hashtag error in PrettyText when processing email (#22680)

Followup to b583872eed539eb510652291b136ffcf8abc4548
and 54001060eaca82196d9ce67531f3fdc319483b97

Another place where we need to filter hashtag types to
only enabled ones is PrettyText, though the latter PR
above should also already make it so the correct priority
types are passed.

This is causing errors in the email processing workflow
for some customers (presumably ones with tagging disabled).

lib/pretty_text/helpers.rb

@@ -125,6 +125,11 @@ module PrettyText
         cooking_user = User.find(cooking_user_id)
       end
 
+      types_in_priority_order =
+        types_in_priority_order.select do |type|
+          HashtagAutocompleteService.data_source_types.include?(type)
+        end
+
       result =
         HashtagAutocompleteService.new(Guardian.new(cooking_user)).lookup(
           [slug],