This is done to speed up development iterations by reducing the time the
of the "compile" job in the following pipelines, and starting ICW jobs
sooner. Runs the unit tests in parallel to ICW jobs.

Pipelines modified:
- gporca-dev
- master build pipeline
- master build pipeline without asserts
- PR pipeline
Co-authored-by: NShreedhar Hardikar <hardikar@cs.wisc.edu>
Co-authored-by: NChris Hajas <chajas@vmware.com>