fix(jsii-dotnet-runtime): Redirect to STDERR.

When JSII_DEBUG is set, STDERR output from the node process should be redirected to the .NET STDERR.

Author: costleya

packages/jsii-dotnet-runtime/src/Amazon.JSII.Runtime/Services/Runtime.cs

@@ -48,8 +48,8 @@ private void RedirectStandardError()
         {
             while (true)
             {
-                Console.WriteLine(_nodeProcess.StandardError.ReadLine());
+                Console.Error.WriteLine(_nodeProcess.StandardError.ReadLine());
             }
         }
     }
-}
+}