.NET: Simplify store=false scenario for responses (#4124)

* Simplify store=false scenario for responses

* Mark AsIChatClientWithStoredOutputDisabled as Experimental

dotnet/samples/GettingStarted/AgentProviders/Agent_With_AzureOpenAIResponses/Program.cs

@@ -5,6 +5,7 @@
 using Azure.AI.OpenAI;
 using Azure.Identity;
 using Microsoft.Agents.AI;
+using Microsoft.Extensions.AI;
 using OpenAI.Responses;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
@@ -21,3 +22,16 @@ AIAgent agent = new AzureOpenAIClient(
 
 // Invoke the agent and output the text result.
 Console.WriteLine(await agent.RunAsync("Tell me a joke about a pirate."));
+
+// Create a responses based agent with "store"=false.
+// This means that chat history is managed locally by Agent Framework
+// instead of being stored in the service (default).
+AIAgent agentStoreFalse = new AzureOpenAIClient(
+    new Uri(endpoint),
+    new DefaultAzureCredential())
+     .GetResponsesClient(deploymentName)
+     .AsIChatClientWithStoredOutputDisabled()
+     .AsAIAgent(instructions: "You are good at telling jokes.", name: "Joker");
+
+// Invoke the agent and output the text result.
+Console.WriteLine(await agentStoreFalse.RunAsync("Tell me a joke about a pirate."));