RESP Authentication should be removed

The security-realm is deprecated on the actual endpoint configurations. RESP currently has this defined. We should remove it and the authentication element and instead enable authentication when the global security-realm is configured. See https://github.com/infinispan/infinispan/pull/9837/files/3f6aa478312eff10dd58b09719d2271fe35e33cc#diff-a7b7ae9e6d3a178397a9a27ff0bdbf90ec2cf92ea4d033e8661305ad97b79c09 for more context.