Remove unused RESTEasy modules

The modules org.jboss.resteasy.resteasy-rxjava2 and org.jboss.resteasy.jose-jwt are provided in WildFly, but never assigned to a deployment or a dependency of any other module. They are both marked "private" and should be removed since they are not used and should not be used by users as they are marked private.

It's been determined that org.jboss.resteasy.resteasy-rxjava2 should remain as it came in via WFLY-10632 & WFLY-10636. The latter being a specific RFE for reactive integration. While the module is marked as private, we should keep it for now. We can consider a making it public or migrate it to rxjava3 at some point.