Fix infinite recursion in test implementations

Co-authored-by: SergeyMenshykh <68852919+SergeyMenshykh@users.noreply.github.com>

Author: Copilot

dotnet/tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.IntegrationTests/ForwardedPropertiesTests.cs

@@ -305,7 +305,7 @@ public FakeForwardedPropsAgent()
 
     protected override Task<AgentRunResponse> RunCoreAsync(IEnumerable<ChatMessage> messages, AgentThread? thread = null, AgentRunOptions? options = null, CancellationToken cancellationToken = default)
     {
-        return this.RunStreamingAsync(messages, thread, options, cancellationToken).ToAgentRunResponseAsync(cancellationToken);
+        return this.RunCoreStreamingAsync(messages, thread, options, cancellationToken).ToAgentRunResponseAsync(cancellationToken);
     }
 
     protected override async IAsyncEnumerable<AgentRunResponseUpdate> RunCoreStreamingAsync(

dotnet/tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.IntegrationTests/SharedStateTests.cs

@@ -344,7 +344,7 @@ internal sealed class FakeStateAgent : AIAgent
 
     protected override Task<AgentRunResponse> RunCoreAsync(IEnumerable<ChatMessage> messages, AgentThread? thread = null, AgentRunOptions? options = null, CancellationToken cancellationToken = default)
     {
-        return this.RunStreamingAsync(messages, thread, options, cancellationToken).ToAgentRunResponseAsync(cancellationToken);
+        return this.RunCoreStreamingAsync(messages, thread, options, cancellationToken).ToAgentRunResponseAsync(cancellationToken);
     }
 
     protected override async IAsyncEnumerable<AgentRunResponseUpdate> RunCoreStreamingAsync(

dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/Sample/06_GroupChat_Workflow.cs

@@ -69,7 +69,7 @@ public override AgentThread DeserializeThread(JsonElement serializedThread, Json
     protected override async Task<AgentRunResponse> RunCoreAsync(IEnumerable<ChatMessage> messages, AgentThread? thread = null, AgentRunOptions? options = null, CancellationToken cancellationToken = default)
     {
         IEnumerable<AgentRunResponseUpdate> update = [
-            await this.RunStreamingAsync(messages, thread, options, cancellationToken)
+            await this.RunCoreStreamingAsync(messages, thread, options, cancellationToken)
                       .SingleAsync(cancellationToken)
                       .ConfigureAwait(false)];