Remove support for logging via GELF #527

Job	Run time
Puppet 7 (Ruby 2.7.8 fixtures=.fixtures.yml)	1m 23s
puppet7 el8 (keycloak=25.0.1 full=no)	5m 59s
Puppet 8 (Ruby 3.2.3 fixtures=.fixtures.yml)	1m 24s
puppet8 el8 (keycloak=25.0.1 full=no)	5m 51s
Puppet 7 (Ruby 2.7.7 fixtures=.fixtures-latest.yml)	1m 23s
puppet7 el9 (keycloak=25.0.1 full=no)	5m 25s
Puppet 8 (Ruby 3.2.2 fixtures=.fixtures-latest.yml)	1m 17s
puppet8 el9 (keycloak=25.0.1 full=no)	5m 13s
puppet7 debian-11 (keycloak=25.0.1 full=no)	6m 33s
puppet8 debian-11 (keycloak=25.0.1 full=no)	6m 17s
puppet7 ubuntu-2004 (keycloak=25.0.1 full=no)	6m 54s
puppet8 ubuntu-2004 (keycloak=25.0.1 full=no)	7m 7s
puppet7 ubuntu-2204 (keycloak=25.0.1 full=no)	6m 35s
puppet8 ubuntu-2204 (keycloak=25.0.1 full=no)	6m 57s
puppet7 el8 (keycloak=25.0.1 full=yes)	47m 50s
puppet8 el8 (keycloak=25.0.1 full=yes)	49m 53s
	2h 46m 1s

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