Add a Galleon layer for batch-jberet

I saw a community request for a Galleon layer for batch-jberet so let's make it first in the set we add to complete coverage of the various subsystems.

Besides the usual layer smoke tests, we can provision a cloud-server+batch-jberet server in testsuite/integration/basic and run most of the batch tests there against it. There are 4 that won't run because they use EJB, Agroal or the org.jboss.remoting3 module, none of which would be provisioned.