nearora-msft: feat: Add migrated label to metrics

JobBuild
292
02-16 21:16
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pull-kubernetes-csi-external-attacher-1-19-on-kubernetes-1-19 1361943445173702656 1361942769555214336 1361938391154823168 1361786579521114112
pull-kubernetes-csi-external-attacher-1-20-on-kubernetes-1-20 1361943445219840000 1361942769597157376 1361938391196766208 1361786579571445760
pull-kubernetes-csi-external-attacher-unit 1361943445249200128 1361942769643294720 1361938391234514944 1361786579609194496