Add support to publish pre-created

The main change made to the workflow is
a. Expand the "CloudServiceProject" so we can instantiate the instance by using a single cloud service configuration file, not a full set of scaffolding files
b. Let workflow use a single CloudServiceProject instance, rather than letting each main step to repeatedly instantiating a new instances which are essentially the same. This enables the switch between publishing from either "service" and "packaging" can be done at one place.