[Workspaces] Add encoder parameter to bitmap.save() (#36228)

* [Workspaces] Add encoder parameter to bitmap.save()

* 1 more call fixed

* Move repeated code to the csharp library

src/modules/Workspaces/WorkspacesCsharpLibrary/Models/BaseApplication.cs

@@ -132,7 +132,7 @@ namespace WorkspacesCsharpLibrary.Models
 
                         using (var memory = new MemoryStream())
                         {
-                            previewBitmap.Save(memory, ImageFormat.Png);
+                            DrawHelper.SaveBitmap(previewBitmap, memory);
                             memory.Position = 0;
 
                             BitmapImage bitmapImage = new BitmapImage();