MOB-9192 - Passing in error under 401

Removing the generic error mapping at Request Handling layer. This is what gets read further and appropriate AuthFailure reasons will be passed to the app.

Author: “Akshay

swift-sdk/Internal/NetworkHelper.swift

@@ -156,6 +156,12 @@ struct NetworkHelper {
         if httpStatusCode >= 500 {
             return .failure(NetworkError(reason: "Internal Server Error", data: data, httpStatusCode: httpStatusCode))
         } else if httpStatusCode >= 400 {
+            
+            if let data = data, 
+                let json = try? JSONSerialization.jsonObject(with: data, options: []) as? [String: Any],
+                let msg = json["msg"] as? String {
+                return .failure(NetworkError(reason: msg, data: data, httpStatusCode: httpStatusCode))
+            }
             return .failure(NetworkError(reason: "Invalid Request", data: data, httpStatusCode: httpStatusCode))
         } else if httpStatusCode == 200 {
             if let data = data, data.count > 0 {