Track additional events

The goal is to eventually add tracking for the following actions:

* Click the "help" button at the top of the page
* Hover over the "more info" icons

This is an early review so that I can get early directional feedback before investing too heavily in a particular approach.
It seemed like we only want this enabled when we are testing auth changes, which will hopefully soon be much less frequent then other types of changes, so it seemed like it made more sense to default to the more common case.

Happy to change back if you disagree or if I'm missing part of the picture here.