Root cause: Microsoft.WSMan.Management and Microsoft.PowerShell.Commands.Diagnostics are not put in the default snapin list for win-ops, and thus when a runspace is created using RunspaceConfiguration, those 2 are not loaded as snapins by default, which is a behavior change compared to Nano PS.
Fix: Replace the guard 'PORTABLE' to be 'UNIX' so that they are in the default snapin list when targeting windows platform.
Made a fix to store data on testdrive instead of system drive
Made a note of where the tests where ported from
Skipped entire test file on non-windows machines