andyzhangx: fix: add lock for prevent account list throttling

JobBuild
242
09-21 03:53
pull-blob-csi-driver-e2e 1307890652033323008
pull-blob-csi-driver-e2e-vmss 1307890652125597696
pull-blob-csi-driver-integration 1307890651970408448
pull-blob-csi-driver-sanity 1307890651928465408
pull-blob-csi-driver-unit 1307890651882328064
pull-blob-csi-driver-verify 1307890651827802112