skip Manual_CertificateOnlySentWhenValid_Success for WinHttpHandler (#73378)

src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.ClientCertificates.cs

@@ -9,6 +9,7 @@
 using System.Security.Cryptography.X509Certificates;
 using System.Threading.Tasks;
 using Microsoft.DotNet.RemoteExecutor;
+using Microsoft.DotNet.XUnitExtensions;
 using Xunit;
 using Xunit.Abstractions;
 
@@ -75,13 +76,16 @@ private HttpClient CreateHttpClientWithCert(X509Certificate2 cert)
 
             return CreateHttpClient(handler);
         }
-            
-        [Theory]
+
+        [ConditionalTheory]
         [InlineData(1, true)]
         [InlineData(2, true)]
         [InlineData(3, false)]
         public async Task Manual_CertificateOnlySentWhenValid_Success(int certIndex, bool serverExpectsClientCertificate)
         {
+            // [ActiveIssue("https://github.com/dotnet/runtime/issues/69238")]
+            if (IsWinHttpHandler) throw new SkipTestException("https://github.com/dotnet/runtime/issues/69238");
+
             var options = new LoopbackServer.Options { UseSsl = true };
 
             X509Certificate2 GetClientCertificate(int certIndex) => certIndex switch