refactor auto_tick.xsh #657
Description
It would be great to refactor auto_tick.xsh. I the main thing that needs to happen is the break up of the run function. Since it does everything, from cloning the bot's fork to issuing the PR we have rather limited opportunities to parallelize parts of the execution. For instance, we might make all but the GH API bits run in parallel, since they are mostly IO bound. However, we want to limit our exposure to the GH API so we don't run into timeouts and such.