Allow skipping draws with broken pipeline variants on Vulkan (#5807)

* Allow skipping draws with broken pipeline variants on Vulkan

* Move IsLinked check to CreatePipeline

* Restore throw on error behaviour for background compile

* Can't remove SetAlphaTest pragmas yet

* Double new line

src/Ryujinx.Graphics.Vulkan/VulkanException.cs

@@ -6,10 +6,16 @@ namespace Ryujinx.Graphics.Vulkan
 {
     static class ResultExtensions
     {
+        public static bool IsError(this Result result)
+        {
+            // Only negative result codes are errors.
+            return result < Result.Success;
+        }
+
         public static void ThrowOnError(this Result result)
         {
             // Only negative result codes are errors.
-            if ((int)result < (int)Result.Success)
+            if (result.IsError())
             {
                 throw new VulkanException(result);
             }