Adapt Wordpress to new plugin integration management [WIP - DO NOT MERGE] #837

Job	Run time
Integration Test / Get runner image / Get runner image	3s
Integration Test / Build and push charm	18s
Integration Test / Build rock / Get rocks	6s
Integration Test / Build image / Get images	3s
Integration Test / Build image / Build image	0s
Integration Test / Build rock / Build rock (wordpress_rock)	3s
Integration Test / Get rocks or Docker images	1s
Integration Test / Integration tests / Integration tests (test_addon)	9m 29s
Integration Test / Integration tests / Integration tests (test_core)	10m 18s
Integration Test / Integration tests / Integration tests (test_external)	9m 36s
Integration Test / Integration tests / Integration tests (test_ingress)	9m 26s
Integration Test / Integration tests / Integration tests (test_cos_grafana)	9m 30s
Integration Test / Integration tests / Integration tests (test_cos_loki)	9m 28s
Integration Test / Integration tests / Integration tests (test_cos_prometheus)	9m 13s
Integration Test / Required Integration Test Status Checks	1s
	1h 7m 35s

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