use new shadowJar-built jar everywhere
use new shadowJar-built jar everywhere

This removes the old custom code for building our own fat jar and
uses the shadowJar-built jar file instead:
 - when building the deployment .zip file
 - when running the conformance tests

openregister/openregister-java,openregister/openregister-java,openregister/openregister-java,openregister/openregister-java,openregister/openregister-java