refactor dup code into helper

Author: aparajit-pratap

src/GregClient/GregClient.cs

@@ -18,7 +18,7 @@ public IAuthProvider AuthProvider
             get { return _authProvider; }
         }
 
-        public GregClient(IAuthProvider provider, string packageManagerUrl)
+        private static void SetTLSHelper()
         {
             // https://stackoverflow.com/questions/2819934/detect-windows-version-in-net
             // if the current OS is windows 7 or lower
@@ -28,6 +28,17 @@ public GregClient(IAuthProvider provider, string packageManagerUrl)
             {
                 ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls12;
             }
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="GregClient"/> class with the specified authentication provider, 
+        /// and package manager URL.
+        /// </summary>
+        /// <param name="provider">The authentication provider used for managing authentication tokens.</param>
+        /// <param name="packageManagerUrl">The base URL of the package manager service.</param>
+        public GregClient(IAuthProvider provider, string packageManagerUrl)
+        {
+            SetTLSHelper();
             _authProvider = provider;
             _client = new RestClient(packageManagerUrl);
         }
@@ -41,14 +52,7 @@ public GregClient(IAuthProvider provider, string packageManagerUrl)
         /// <param name="httpClient">An optional HTTP client to use for making requests. If null, a default client is created.</param>
         public GregClient(IAuthProvider provider, string packageManagerUrl, HttpClient httpClient)
         {
-            // https://stackoverflow.com/questions/2819934/detect-windows-version-in-net
-            // if the current OS is windows 7 or lower
-            // set TLS to 1.2.
-            // else do nothing and let the OS decide the version of TLS to support. (.net 4.7 required)
-            if (System.Environment.OSVersion.Version.Major <= 6 && System.Environment.OSVersion.Version.Minor <= 1)
-            {
-                ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls12;
-            }
+            SetTLSHelper();
             _authProvider = provider;
 
             var baseUrl = new Uri(packageManagerUrl);