Middleware overhaul! (#18218)

* Middleware overhaul!

- Remove unnecessary 'async' keywords from middleware functions
- Ensure all middleware functions we create have names
- Wrap the method contents of all async middleware functions in a try-catch+next(error) pattern

* Use asyncMiddleware wrapper instead of try-catch+next(error) pattern

* Remove unnecessary try-catch+next(error) pattern from context middleware

middleware/handle-csrf-errors.js

@@ -1,4 +1,4 @@
-module.exports = async function handleCSRFError (error, req, res, next) {
+module.exports = function handleCSRFError (error, req, res, next) {
   // If the CSRF token is bad
   if (error.code === 'EBADCSRFTOKEN') {
     return res.sendStatus(403)