andyzhangx: cleanup: refine csi-proxy v1beta interface

JobBuild
952
07-26 02:03
pull-azuredisk-csi-driver-e2e-migration 1419478397687435264
pull-azuredisk-csi-driver-e2e-migration-windows 1419478397725184000
pull-azuredisk-csi-driver-e2e-multi-az 1419495662428360704 1419478397641297920
pull-azuredisk-csi-driver-e2e-single-az 1419478397582577664
pull-azuredisk-csi-driver-e2e-windows 1419478397762932736
pull-azuredisk-csi-driver-e2e-windows-containerd 1419478399071555584
pull-azuredisk-csi-driver-external-e2e-single-az 1419478398220111872
pull-azuredisk-csi-driver-integration 1419478397544828928
pull-azuredisk-csi-driver-sanity 1419478397502885888
pull-azuredisk-csi-driver-unit 1419478397465137152
pull-azuredisk-csi-driver-verify 1419478397423194112
pull-azuredisk-csi-driver-windows-build 1419478397796487168