DEV: Avoid logging routing errors (#20622)

The logs are usually caused by the client and is of no use to us.

lib/middleware/discourse_public_exceptions.rb

@@ -10,6 +10,7 @@ module Middleware
           Rack::QueryParser::InvalidParameterError,
           ActionController::BadRequest,
           ActionDispatch::Http::Parameters::ParseError,
+          ActionController::RoutingError,
         ],
       )