When deploying a site extension deploy its WebJobs.

The site extension needs to have the WebJobs under `App_Data\jobs\{job type}\{job name}`.
The jobs will be moved (not copied).
The result WebJob name will be `{site extension id}({job name})`.
Fixes #1393
It's not clear to me what the `(*)` part is about. Could use some comments to clarify.