chore: remove start event handler #671

Job	Run time
Integration Test / Get runner image / Get runner image	3s
Integration Test / Build and push charm	7m 27s
Integration Test / Build image / Get images	3s
Integration Test / Build rock / Get rocks	7s
Integration Test / Build rock / Build rock (wordpress_rock)	10m 42s
Integration Test / Build image / Build image	0s
Integration Test / Get rocks or Docker images	4s
Integration Test / Integration tests / Integration tests (test_addon)	30m 9s
Integration Test / Integration tests / Integration tests (test_core)	27m 29s
Integration Test / Integration tests / Integration tests (test_external)	31m 6s
Integration Test / Integration tests / Integration tests (test_ingress)	32m 12s
Integration Test / Integration tests / Integration tests (test_cos_grafana)	26m 27s
Integration Test / Integration tests / Integration tests (test_cos_loki)	31m 34s
Integration Test / Integration tests / Integration tests (test_cos_prometheus)	28m 48s
Integration Test / Required Integration Test Status Checks	7s
	3h 46m 18s

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