This PR updates the track_ecommerce_events.js to allow imports into webpacked code &
adds upsell tracking to the course upgrade buttons on the program dashboard. We are doing this so we have a better understanding of when users are clicking our upsell links.
Create a Javascript function to log upsell events to & attach the eventing to the course dashboard upsell button. The revenue squad is looking for more insight into which buttons users are clicking to get to the checkout page.
