fix(Request): Remove string parsing of status code to long

The ToString method of the .NET error code results in the actual string explanation of the error
code. When trying to parse this to a long we end up with error code 0. Cast the code as a long
instead.

src/IBM.Cloud.SDK.Core/Http/Request.cs

@@ -130,8 +130,7 @@ public async Task<DetailedResponse<T>> As<T>()
                 detailedResponse.Headers.Add(header.Key, string.Join(",", header.Value));
 
             //  Set staus code
-            long.TryParse(message.StatusCode.ToString(), out long statusCode);
-            detailedResponse.StatusCode = statusCode;
+            detailedResponse.StatusCode = (long)message.StatusCode;
 
             //  Set response
             detailedResponse.Response = JValue.Parse(result).ToString(Formatting.Indented);