fix: use ConfigureWebHost instead of ConfigureWebHostDefaults for TestServer

ConfigureWebHostDefaults applies Kestrel defaults AFTER the user's
configure action runs, overriding the UseTestServer() call. Using
ConfigureWebHost instead ensures only TestServer is configured as
the web server.

Signed-off-by: Shashwat Sinha <shashwat.sinha2003@gmail.com>

Author: ShashwatSinha03

src/Lucene.Net.Tests.Replicator/ReplicatorTestCase.cs

@@ -87,10 +87,10 @@ public static TestServer NewHttpServer(IReplicationService service, MockErrorCon
             if (useStartupClass)
             {
                 var hostBuilder = new HostBuilder()
-                    .ConfigureWebHostDefaults(webBuilder =>
+                    .ConfigureWebHost(webBuilder =>
                     {
-                        webBuilder.UseTestServer();
-                        webBuilder.ConfigureServices(container =>
+                        webBuilder.UseTestServer()
+                        .ConfigureServices(container =>
                         {
                             container.AddSingleton(service);
                             container.AddSingleton(mockErrorConfig);
@@ -114,10 +114,10 @@ public static TestServer NewHttpServer(IReplicationService service, MockErrorCon
             else
             {
                 var hostBuilder = new HostBuilder()
-                    .ConfigureWebHostDefaults(webBuilder =>
+                    .ConfigureWebHost(webBuilder =>
                     {
-                        webBuilder.UseTestServer();
-                        webBuilder.ConfigureServices(container =>
+                        webBuilder.UseTestServer()
+                        .ConfigureServices(container =>
                         {
                             container.AddRouting();
                             container.AddSingleton(service);