Deprecate API v2 (#7761)

* deprecate api-v2

* remove v2 test helpers

* remove unused string

website/server/middlewares/setupBody.js

@@ -0,0 +1,5 @@
+// TODO test this middleware
+module.exports = function setupBodyMiddleware (req, res, next) {
+  req.body = req.body || {};
+  next();
+};