models: drop various unused #named methods.

app/models/artist.rb

@@ -464,10 +464,6 @@ class Artist < ApplicationRecord
   end
 
   module SearchMethods
-    def named(name)
-      where(name: normalize_name(name))
-    end
-
     def any_other_name_matches(regex)
       where(id: Artist.from("unnest(other_names) AS other_name").where("other_name ~ ?", regex))
     end