.NET: Add missing workflow properties to the workflow.definition tag (#1261)

* add workflow edge data properties to the workflow.definition tag.

* use workflow info classes for workflow.definition tag value

* add unit test

* fix test

* fix formatting issue

* remove flaky unit test

* remove unused package dependency

dotnet/src/Microsoft.Agents.AI.Workflows/WorkflowBuilder.cs

@@ -7,6 +7,7 @@ using System.Linq;
 using System.Text.Json;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.Agents.AI.Workflows.Checkpointing;
 using Microsoft.Agents.AI.Workflows.Observability;
 using Microsoft.Shared.Diagnostics;
 
@@ -414,23 +415,13 @@ public class WorkflowBuilder
         {
             activity?.SetTag(Tags.WorkflowDescription, workflow.Description);
         }
-        if (activity is not null)
-        {
-            var workflowJsonDefinitionData = new WorkflowJsonDefinitionData
-            {
-                StartExecutorId = this._startExecutorId,
-                Edges = this._edges.Values.SelectMany(e => e),
-                Ports = this._inputPorts.Values,
-                OutputExecutors = this._outputExecutors
-            };
-            activity.SetTag(
+        activity?.SetTag(
                 Tags.WorkflowDefinition,
                 JsonSerializer.Serialize(
-                    workflowJsonDefinitionData,
-                    WorkflowJsonDefinitionJsonContext.Default.WorkflowJsonDefinitionData
+                    workflow.ToWorkflowInfo(),
+                    WorkflowsJsonUtilities.JsonContext.Default.WorkflowInfo
                 )
             );
-        }
 
         return workflow;
     }

dotnet/src/Microsoft.Agents.AI.Workflows/WorkflowJsonDefintion.cs

@@ -1,20 +0,0 @@
-// Copyright (c) Microsoft. All rights reserved.
-
-using System.Collections.Generic;
-using System.Text.Json.Serialization;
-
-namespace Microsoft.Agents.AI.Workflows;
-
-[JsonSourceGenerationOptions(UseStringEnumConverter = true)]
-[JsonSerializable(typeof(WorkflowJsonDefinitionData))]
-internal partial class WorkflowJsonDefinitionJsonContext : JsonSerializerContext
-{
-}
-
-internal class WorkflowJsonDefinitionData
-{
-    public string StartExecutorId { get; set; } = string.Empty;
-    public IEnumerable<Edge> Edges { get; set; } = [];
-    public IEnumerable<RequestPort> Ports { get; set; } = [];
-    public IEnumerable<string> OutputExecutors { get; set; } = [];
-}