remove a couple of the most frequent spans
remove a couple of the most frequent spans

Trying to get us back below our honeycomb quota. These three spans
seem to be the most common.

They don't seem to be very illuminating by themselves; just called a
lot during the whole recursive rendering that we're running into.

appsembler/edx-platform,appsembler/edx-platform,appsembler/edx-platform,appsembler/edx-platform