make SC user agent pool configurable #288

Job	Run time
Ensure PR is submitted from Azure/ARO-HCP	1s
Deploy global resources	6m 14s
Build service images / build_push_ocmirror	4m 11s
Build service images / build_push_frontend	6m 30s
Build service images / build_push_backend	6m 5s
Build service images / build_push_imagesync	4m 34s
Deploy Image Sync	3m 41s
Deploy CS PR infrastructure / deploy_region_rg	4m 59s
Deploy integrated DEV infrastructure / deploy_region_rg	5m 23s
Deploy CS PR infrastructure / deploy_management_cluster_rg	8m 40s
Deploy CS PR infrastructure / deploy_service_cluster_rg	16m 57s
Deploy integrated DEV infrastructure / deploy_service_cluster_rg	55m 44s
Deploy integrated DEV infrastructure / deploy_management_cluster_rg	8m 33s
Deploy services to CS PR / deploy_to_management_cluster	4m 17s
Deploy services to CS PR / deploy_to_service_cluster	4m 27s
Deploy services to integrated DEV	0s
	2h 20m 16s

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