Add backchannel_logout attributes #645

Job	Run time
Puppet 8 (Ruby 3.2.3)	1m 18s
puppet8 debian-12 (keycloak=25.0.1 full=no)	6m 7s
puppet8 ubuntu-2204 (keycloak=25.0.1 full=no)	7m 13s
puppet8 el8 (keycloak=25.0.1 full=no)	5m 50s
puppet8 ubuntu-2404 (keycloak=25.0.1 full=no)	6m 41s
puppet8 el8 (keycloak=25.0.1 full=batch1)	28m 57s
puppet8 el8 (keycloak=25.0.1 full=batch2)	20m 3s
puppet8 el10 (keycloak=25.0.1 full=no)	5m 8s
puppet8 el9 (keycloak=25.0.1 full=no)	5m 47s
puppet8 debian-11 (keycloak=25.0.1 full=no)	6m 8s
	1h 33m 12s

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