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

Followup to b583872eed
and 54001060ea

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],