Maintain test artifacts

Improved test diagnostics
Providing diagnostics about failed process.
Workaround for https://github.com/NuGet/Home/issues/1977
get past crossgen errors!

test/Microsoft.DotNet.Tools.Tests.Utilities/Commands/TestCommand.cs

@@ -80,6 +80,7 @@ namespace Microsoft.DotNet.Tools.Test.Utilities
             threadErr.Join();
 
             var result = new CommandResult(
+                process.StartInfo,
                 process.ExitCode, 
                 stdOut.GetCapturedOutput(), 
                 stdErr.GetCapturedOutput());