Count actions resolve failures as infra failures (#851)

During job run we may fail to resolve actions download info, and this
stack is fully controlled by GitHub actions so it should be counted as
infrastructure failure instead of user failure.

src/Sdk/DTWebApi/WebApi/Exceptions.cs

@@ -2458,4 +2458,23 @@ namespace GitHub.DistributedTask.WebApi
         {
         }
     }
+
+    [Serializable]
+    public sealed class FailedToResolveActionDownloadInfoException : DistributedTaskException
+    {
+        public FailedToResolveActionDownloadInfoException(String message)
+            : base(message)
+        {
+        }
+
+        public FailedToResolveActionDownloadInfoException(String message, Exception innerException)
+            : base(message, innerException)
+        {
+        }
+
+        private FailedToResolveActionDownloadInfoException(SerializationInfo info, StreamingContext context)
+            : base(info, context)
+        {
+        }
+    }
 }