fix(analytics): send user on reg (#8044)

Also fixes an issue that could prevent item name data from being correctly sent to Amplitude.

website/server/controllers/api-v3/auth.js

@@ -155,6 +155,7 @@ api.registerLocal = {
         gaLabel: 'local',
         uuid: savedUser._id,
         headers: req.headers,
+        user: savedUser,
       });
     }