remove external DNS from MGMT cluster #460

Job	Run time
Deploy global resources	5m 55s
Build service images / build_push_ocmirror	4m 4s
Build service images / build_push_frontend	6m 12s
Build service images / build_push_backend	6m 14s
Build service images / build_push_imagesync	4m 40s
Deploy Image Sync	3m 59s
Deploy CS PR infrastructure / deploy_region_rg	4m 26s
Deploy integrated DEV infrastructure / deploy_region_rg	4m 31s
Deploy CS PR infrastructure / deploy_management_cluster_rg	9m 13s
Deploy CS PR infrastructure / deploy_service_cluster_rg	15m 21s
Deploy integrated DEV infrastructure / deploy_service_cluster_rg	16m 41s
Deploy integrated DEV infrastructure / deploy_management_cluster_rg	9m 30s
Deploy services to CS PR / deploy_to_service_cluster	4m 30s
Deploy services to CS PR / deploy_to_management_cluster	4m 46s
Deploy services to integrated DEV / deploy_to_service_cluster	4m 21s
Deploy services to integrated DEV / deploy_to_management_cluster	4m 31s
	1h 48m 54s

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