Add pipeline-groovy-lib plugin test #558

Job	Run time
integration-tests / Get runner image / Get runner image	5s
integration-tests / Build and push charm	2m 49s
integration-tests / Build rock / Get rocks	4s
integration-tests / Build image / Get images	3s
integration-tests / Build rock / Build rock (jenkins_rock)	4m 26s
integration-tests / Build image / Build image	0s
integration-tests / Get rocks or Docker images	1s
integration-tests / Integration tests / Integration tests (test_jenkins.py)	18m 34s
integration-tests / Integration tests / Integration tests (test_k8s_agent.py)	18m 51s
integration-tests / Integration tests / Integration tests (test_machine_agent.py)	20m 50s
integration-tests / Integration tests / Integration tests (test_plugins.py)	37m 45s
integration-tests / Integration tests / Integration tests (test_proxy.py)	13m 59s
integration-tests / Integration tests / Integration tests (test_cos.py)	25m 54s
integration-tests / Required Integration Test Status Checks	1s
	2h 23m 22s

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