.NET: Add workflow as an agent with observability sample (#1612)

* Add workflow as an agent with observability sample

* Address comment

* Fix formatting

* enable sensitive data

* enable sensitive data for sub agents

* adjust aggregator handlers

dotnet/samples/GettingStarted/AgentOpenTelemetry/Program.cs

@@ -125,7 +125,7 @@ var agent = new ChatClientAgent(instrumentedChatClient,
     instructions: "You are a helpful assistant that provides concise and informative responses.",
     tools: [AIFunctionFactory.Create(GetWeatherAsync)])
     .AsBuilder()
-    .UseOpenTelemetry(SourceName) // enable telemetry at the agent level
+    .UseOpenTelemetry(SourceName, configure: (cfg) => cfg.EnableSensitiveData = true) // enable telemetry at the agent level
     .Build();
 
 var thread = agent.GetNewThread();
@@ -134,6 +134,8 @@ appLogger.LogInformation("Agent created successfully with ID: {AgentId}", agent.
 
 // Create a parent span for the entire agent session
 using var sessionActivity = activitySource.StartActivity("Agent Session");
+Console.WriteLine($"Trace ID: {sessionActivity?.TraceId} ");
+
 var sessionId = Guid.NewGuid().ToString("N");
 sessionActivity?
     .SetTag("agent.name", "OpenTelemetryDemoAgent")
@@ -147,7 +149,7 @@ using (appLogger.BeginScope(new Dictionary<string, object> { ["SessionId"] = ses
 
     while (true)
     {
-        Console.Write("You: ");
+        Console.Write("You (or 'exit' to quit): ");
         var userInput = Console.ReadLine();
 
         if (string.IsNullOrWhiteSpace(userInput) || userInput.Equals("exit", StringComparison.OrdinalIgnoreCase))