CMD-1245 - Improves proxy URI handling (#220)

* Improves proxy URI handling

Refines the creation of WebProxy addresses by using `UriKind.RelativeOrAbsolute` for more robust URI parsing, which can better accommodate various proxy URI formats.
Adds logging to provide visibility into the proxy URI received from environment variables and the final address assigned to the WebProxy, aiding in troubleshooting proxy configuration.

Relates to CDMS-1245

* Organizes using directives

Reorders `System` namespaces to the top of the file, improving code readability and adhering to common C# style guidelines.

Relates to CDMS-1245

* updates

Author: t11omas

BtmsGateway/Utils/Http/Proxy.cs

@@ -5,7 +5,7 @@
 using Polly.Extensions.Http;
 using Polly.Retry;
 using Polly.Timeout;
-using Environment = System.Environment;
+using Serilog;
 
 namespace BtmsGateway.Utils.Http;
 
@@ -91,11 +91,13 @@ public static HttpClientHandler CreateHttpClientHandler(string? proxyUri)
 
     public static WebProxy CreateProxy(string? proxyUri)
     {
+        Log.Logger.Information("Proxy Uri from ENV: {ProxyUri}", proxyUri);
         var proxy = new WebProxy { BypassProxyOnLocal = false };
         if (proxyUri != null)
         {
-            proxy.Address = new UriBuilder(proxyUri).Uri;
+            proxy.Address = new Uri(proxyUri, UriKind.RelativeOrAbsolute);
         }
+        Log.Logger.Information("WebProxy.Address: {ProxyUri}", proxy.Address);
         return proxy;
     }
 }