Add Sentry to client for error handling (#43920)

Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>

api-server/src/server/middlewares/sentry-request-handler.js

@@ -2,7 +2,7 @@ import { Handlers } from '@sentry/node';
 import { sentry } from '../../../../config/secrets';
 
 export default function sentryRequestHandler() {
-  return sentry.dns === 'dsn_from_sentry_dashboard'
+  return sentry.dsn === 'dsn_from_sentry_dashboard'
     ? (req, res, next) => next()
     : Handlers.requestHandler();
 }