Skip file upload test for now
Skip file upload test for now

We're seeing some intermittent unreliability from this test case right
now (the owning team is looking into it), so let's put in a skip so that
we keep working on getting some of these other Go changesets in.

Note that we still compile the test, so at least we get a baseline
guarantee that things aren't too wildly incorrect.

ChannelMeter/stripe-go,stripe/stripe-go,stripe/stripe-go,ChannelMeter/stripe-go