doc: document ARO-HCP Clusters creation in CS with Managed Identities #914

Job	Run time
Deploy global resources	7m 0s
Build service images / build_push_frontend	6m 10s
Build service images / build_push_ocmirror	4m 11s
Build service images / build_push_imagesync	4m 28s
Build service images / build_push_backend	5m 55s
Deploy Image Sync	4m 17s
Deploy CS PR infrastructure / deploy_region_rg	4m 24s
Deploy integrated DEV infrastructure / deploy_region_rg	4m 52s
Deploy CS PR infrastructure / deploy_service_cluster_rg	25m 37s
Deploy CS PR infrastructure / deploy_management_cluster_rg	9m 47s
Deploy integrated DEV infrastructure / deploy_service_cluster_rg	24m 48s
Deploy integrated DEV infrastructure / deploy_management_cluster_rg	10m 33s
Deploy services to integrated DEV	0s
Deploy services to CS PR / deploy_to_service_cluster	4m 29s
Deploy services to CS PR / deploy_to_management_cluster	4m 24s
	2h 0m 55s

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