Remove GenericJbossMarshaller automatic configuration

Currently if the infinispan-jboss-marshalling module is on the client classpath we automatically configure the client marshaller to be GenericJBossMarshaller. This causes issues with our testsuite, as the module is often on the classpath. Furthermore, we want users to start transitioning away from JBoss Marshalling. Therefore, from Infinispan 12 11 we should no automatically configure this marshaller if the module is present.