Deprecate API v2 (#7761)

* deprecate api-v2

* remove v2 test helpers

* remove unused string

website/server/middlewares/analytics.js

@@ -0,0 +1,23 @@
+import nconf from 'nconf';
+import {
+ track,
+ trackPurchase,
+ mockAnalyticsService,
+} from '../libs/analyticsService';
+
+let service;
+
+if (nconf.get('IS_PROD')) {
+  service = {
+    track,
+    trackPurchase,
+  };
+} else {
+  service = mockAnalyticsService;
+}
+
+module.exports = function attachAnalytics (req, res, next) {
+  res.analytics = service;
+
+  next();
+};