VE-1177 Track VisualEditor events at 100% sampling

I think this should be OK. I asked Christian about the pageview tracking he's working on for VE. He is planning to push the ve._trackPageview in a different way. So, in this file, pageviews for VE would be skipped, but they will be handled in a different place in the code. I'm not sure there are other "track" calls beside those two that we need to handle.