Tracking on failed in-app trial submissions

Summary

At one point in time we tracked failed trial submissions(submissions to subscriptions/trials#create) on the frontend in this code that would create the create_trial_error tracking event.

At some point in time this was made to not work. See this discussion.

Solution.

Preferred

• Remove the javascript and be fine w/o error tracking on trials

Alternative

• Restore the event creation on failed in-app trial submissions and decide if it is ok to do in the backend(more exact perhaps) or restore the frontend tracking functionality