Enable building universal (x64,arm64) binaries for MacOS#64

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adityapatwardhan merged 5 commits intoPowerShell:masterfrom

SteveL-MSFT:build-m1

Mar 9, 2021

Commits on Feb 28, 2021

Commits on Mar 1, 2021

change to vmimage pool
SteveL-MSFT
committed

Commits on Mar 8, 2021

change release build to use macOS-latest vmimage which has xcode12
SteveL-MSFT
committed