[main] Source code updates from dotnet/dotnet#2810

dotnet-maestro[bot] wants to merge 9 commits into

maindotnet/command-line-api:mainfrom

darc-main-a1f2a0d6-72ed-499c-87ef-c8a4b4c7a070dotnet/command-line-api:darc-main-a1f2a0d6-72ed-499c-87ef-c8a4b4c7a070Copy head branch name to clipboard