Move test RPS to artifacts directory (#64124)
Move test RPS to artifacts directory (#64124)

This moves our generated vstest RSP files into the tmp folder under
artifacts. Previously they were being dropped into the root which was
causing them to show up in `git status` calls.

closes #63779
CyrusNajmabadi/roslyn,shyamnamboodiripad/roslyn,shyamnamboodiripad/roslyn,bartdesmet/roslyn,jasonmalinowski/roslyn,dotnet/roslyn,CyrusNajmabadi/roslyn,dotnet/roslyn,bartdesmet/roslyn,jasonmalinowski/roslyn,bartdesmet/roslyn,mavasani/roslyn,CyrusNajmabadi/roslyn,mavasani/roslyn,mavasani/roslyn,dotnet/roslyn,jasonmalinowski/roslyn,shyamnamboodiripad/roslyn