Wrap import of DSC module with ProgressPreference = SilentlyContinue

And set it back afterwards. Since it has `ErrorAction = Ignore` it
should always get set back correctly. This prevents the progress pane
from getting stuck in certain circumstances.

Author: andyleejordan

src/PowerShellEditorServices/Services/PowerShell/Debugging/DscBreakpointCapability.cs

@@ -92,10 +92,13 @@ public static async Task<DscBreakpointCapability> GetDscCapabilityAsync(
             if (!isDscInstalled.HasValue)
             {
                 PSCommand psCommand = new PSCommand()
+                    .AddScript("$prevProgressPreference = $ProgressPreference")
+                    .AddScript("$ProgressPreference = 'SilentlyContinue'")
                     .AddCommand(@"Microsoft.PowerShell.Core\Import-Module")
-                    .AddParameter("-Name", "PSDesiredStateConfiguration")
+                    .AddParameter("Name", "PSDesiredStateConfiguration")
                     .AddParameter("PassThru")
-                    .AddParameter("ErrorAction", ActionPreference.Ignore);
+                    .AddParameter("ErrorAction", ActionPreference.Ignore)
+                    .AddScript("$ProgressPreference = $prevProgressPreference");
 
                 IReadOnlyList<PSModuleInfo> dscModule =
                     await psesHost.ExecutePSCommandAsync<PSModuleInfo>(

src/PowerShellEditorServices/Services/PowerShell/Utility/PowerShellExtensions.cs

@@ -140,7 +140,7 @@ public static void SetCorrectExecutionPolicy(this PowerShell pwsh, ILogger logge
             // Calling the cmdlet is the simplest way to do that
             IReadOnlyList<PSObject> policies = pwsh
                 .AddCommand(@"Microsoft.PowerShell.Security\Get-ExecutionPolicy")
-                    .AddParameter("-List")
+                .AddParameter("List")
                 .InvokeAndClear<PSObject>();
 
             // The policies come out in the following order:
@@ -223,7 +223,7 @@ public static void LoadProfiles(this PowerShell pwsh, ProfilePathInfo profilePat
         public static void ImportModule(this PowerShell pwsh, string moduleNameOrPath)
         {
             pwsh.AddCommand(@"Microsoft.PowerShell.Core\Import-Module")
-                .AddParameter("-Name", moduleNameOrPath)
+                .AddParameter("Name", moduleNameOrPath)
                 .InvokeAndClear();
         }