Replace the open to closed pump with a proper web hook running in Azure

[jasonmalinowski]

Our current tool has many problems with it:

1. It's running on a fixed machine, which means we lose the pump if the machine goes offline.
2. It has a configured set of branches, when it should really work on all branches as long as the same name exists in opened and closed.
3. It's mirroring to VSTS as well, which we are obsoleting with the move to MicroBuild v2

@jaredpar has proposed that if we replace this with a GitHub webhook that responds on a push to our branch, and that the webhook just lives in Azure, then we can solve both of these issues.

[agocke]

This is obsolete -- we shouldn't need a pump any more.

[jasonmalinowski]

@agocke We still have the pump for integration testing. What's the plan for that?

[agocke]

@jasonmalinowski Ah I forgot about that.

[jasonmalinowski]

It's definitely obsolete now. :-)