Don't attempt to import DSC module on PowerShell core

Also, use env var for ProgramFiles location.

Author: rkeithhill

src/PowerShellEditorServices/Session/Capabilities/DscBreakpointCapability.cs

@@ -84,15 +84,17 @@ public static DscBreakpointCapability CheckForCapability(
         {
             DscBreakpointCapability capability = null;
 
-            if (runspaceDetails.Context != RunspaceContext.DebuggedRunspace)
+            // DSC support is enabled only for Windows PowerShell.
+            if ((runspaceDetails.PowerShellVersion.Version.Major < 6) &&
+                (runspaceDetails.Context != RunspaceContext.DebuggedRunspace))
             {
                 using (PowerShell powerShell = PowerShell.Create())
                 {
                     powerShell.Runspace = runspaceDetails.Runspace;
 
                     // Attempt to import the updated DSC module
                     powerShell.AddCommand("Import-Module");
-                    powerShell.AddArgument(@"C:\Program Files\DesiredStateConfiguration\1.0.0.0\Modules\PSDesiredStateConfiguration\PSDesiredStateConfiguration.psd1");
+                    powerShell.AddArgument(@"${env:ProgramFiles}\DesiredStateConfiguration\1.0.0.0\Modules\PSDesiredStateConfiguration\PSDesiredStateConfiguration.psd1");
                     powerShell.AddParameter("PassThru");
                     powerShell.AddParameter("ErrorAction", "Ignore");