Version Control Migration

Is there any method of migrating JAL scripts through a version control system, such as, Harvest?

There is no direct hook for a source control system. However, you can use JAL or one of 24x7 APIs to run a periodic process exporting job scripts to files and updating your source control system from files. This is especially easy with SVN which supports command line interface that can be invoked from any script or program and it only updates files in which it finds differences, ignoring content-matching files.

Is it possible for the VCS to promote the job and script into the new environment?

Yes, it is possible. You can script that using 24x7 API; in other words script job deployment to a different environment, local or remote. Please see http://www.softtreetech.com/24x7/24x7_COM.pdf and http://www.softtreetech.com/24x7/24x7java.pdf