.NET: Fix bugbash issues (#448)

* Fix bugbash issues

* Update dotnet/samples/GettingStarted/Providers/AIAgent_With_OpenAIResponseClient.cs

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

dotnet/src/Microsoft.Extensions.AI.Agents.OpenAI/ChatOptionsExtensions.cs

@@ -0,0 +1,28 @@
+// Copyright (c) Microsoft. All rights reserved.
+using Microsoft.Shared.Diagnostics;
+using OpenAI.Responses;
+
+namespace Microsoft.Extensions.AI.Agents;
+
+/// <summary>
+/// Extension methods for <see cref="ChatOptions"/>
+/// </summary>
+public static class ChatOptionsExtensions
+{
+    /// <summary>
+    /// Disables the storage of response output in the chat options.
+    /// </summary>
+    /// <param name="options">Instance of <see cref="ChatOptions"/></param>
+    /// <exception cref="ArgumentNullException"></exception>
+    public static ChatOptions WithResponseStoredOutputDisabled(this ChatOptions options)
+    {
+        Throw.IfNull(options);
+
+        // We can use the RawRepresentationFactory to provide Response service specific
+        // options. Here we can indicate that we do not want the service to store the
+        // conversation in a service managed thread.
+        options.RawRepresentationFactory = (_) => new ResponseCreationOptions() { StoredOutputEnabled = false };
+
+        return options;
+    }
+}