Adapt Wordpress to new plugin integration management [WIP - DO NOT MERGE] #835

Job	Run time
Integration Test / Get runner image / Get runner image	5s
Integration Test / Build and push charm	2m 44s
Integration Test / Build image / Get images	3s
Integration Test / Build rock / Get rocks	3s
Integration Test / Build rock / Build rock (wordpress_rock)	6m 57s
Integration Test / Build image / Build image	0s
Integration Test / Get rocks or Docker images	1s
Integration Test / Integration tests / Integration tests (test_addon)	7m 25s
Integration Test / Integration tests / Integration tests (test_core)	6m 54s
Integration Test / Integration tests / Integration tests (test_external)	9m 14s
Integration Test / Integration tests / Integration tests (test_ingress)	8m 52s
Integration Test / Integration tests / Integration tests (test_cos_grafana)	8m 28s
Integration Test / Integration tests / Integration tests (test_cos_loki)	8m 32s
Integration Test / Integration tests / Integration tests (test_cos_prometheus)	7m 2s
Integration Test / Required Integration Test Status Checks	1s
	1h 6m 21s

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