cleanup + fix tests for net8

src/WireMock.Net.Minimal/Compatibility/WebProxy.cs

@@ -1,28 +0,0 @@
-// Copyright © WireMock.Net
-
-#if NETSTANDARD1_3
-
-// ReSharper disable once CheckNamespace
-namespace System.Net;
-
-internal class WebProxy : IWebProxy
-{
-    private readonly string _proxy;
-    public ICredentials? Credentials { get; set; }
-
-    public WebProxy(string proxy)
-    {
-        _proxy = proxy;
-    }
-
-    public Uri GetProxy(Uri destination)
-    {
-        return new Uri(_proxy);
-    }
-
-    public bool IsBypassed(Uri host)
-    {
-        return true;
-    }
-}
-#endif