chore: import upstream snapshot with attribution

dotnet/tests/AgentConformance.IntegrationTests/Support/SessionCleanup.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System;
+using System.Threading.Tasks;
+using Microsoft.Agents.AI;
+
+namespace AgentConformance.IntegrationTests.Support;
+
+/// <summary>
+/// Helper class to delete sessions after tests.
+/// </summary>
+/// <param name="session">The session to delete.</param>
+/// <param name="fixture">The fixture that provides agent specific capabilities.</param>
+public sealed class SessionCleanup(AgentSession session, IAgentFixture fixture) : IAsyncDisposable
+{
+    public async ValueTask DisposeAsync() =>
+        await fixture.DeleteSessionAsync(session);
+}