Try to prevent late/duplicate response errors (#20077)

* Ensure all Express 'next' calls include 'return's

* Add headersSent checks during archived versions flow

* Return a 404 earlier if archived resource fetch fails

* Short-circuit responses for archived stuff

* Be more careful about responding to and short-circuiting after search requests

* Fix tests

middleware/handle-next-data-path.js

@@ -15,5 +15,5 @@ module.exports = async function handleNextDataPath (req, res, next) {
     req.pagePath = req.path
   }
 
-  next()
+  return next()
 }