Merge pull request #4100 from overleaf/ab-sub-page-click-event

Add event on subscription page upgrade button click

GitOrigin-RevId: 964eb6ad2d6ee7eceb3aac54501a61601d4948ac

services/web/frontend/js/main/subscription/upgrade-subscription.js

@@ -5,6 +5,7 @@ export default App.controller(
   function ($scope, eventTracking) {
     $scope.upgradeSubscription = function () {
       eventTracking.send('subscription-funnel', 'subscription-page', 'upgrade')
+      eventTracking.sendMB('subscription-page-upgrade-button-click')
     }
   }
 )