CI in backport PRs are now failing because Windows.10.Amd64.Server19H1.ES.Open is reaching EOL, example: https://dev.azure.com/dnceng/public/_build/results?buildId=1674630&view=logs&j=457f7e88-dfa2-5bd9-f871-fdf124c2477d&t=bfe52dfb-2099-5c7f-ee52-70a1d81c544e&l=53
##[error]SENDHELIXJOB(0,0): error : Helix queue windows.10.amd64.server19h1.es.open is set for estimated removal date of 2022-03-31. In most cases the queue will be removed permanently due to end-of-life; please contact dnceng for any questions or concerns, and we can help you decide how to proceed and discuss other options.
Please backport #66404 to 6.0