[rel/18.0] Source code updates from dotnet/dotnet#15367

nohwnd merged 8 commits intorel/18.0microsoft/vstest:rel/18.0from

darc-rel/18.0-2821b091-cec2-4b21-802f-70fbcdcb0034microsoft/vstest:darc-rel/18.0-2821b091-cec2-4b21-802f-70fbcdcb0034Copy head branch name to clipboard