andyzhangx: test: switch to use mcr nginx image

JobBuild
244
09-23 07:47
pull-blob-csi-driver-e2e 1308716019040129024 1308674341256302592
pull-blob-csi-driver-e2e-vmss 1308716019061100544 1308681224306298880 1308674341281468416
pull-blob-csi-driver-integration 1308716019010768896 1308674341231136768
pull-blob-csi-driver-sanity 1308716018993991680 1308674729946648576 1308674341205970944
pull-blob-csi-driver-unit 1308716018968825856 1308674341189193728
pull-blob-csi-driver-verify 1308716018943660032 1308674341168222208