Perform Node 6-16 -> 20 runner upgrade experiment (#4915)

* Perform Node 6-16 -> 20 runner upgrade experiment

-- Allow publish agent worker's telemetry through commandExtension API.

* Perform Node 6-16 -> 20 runner upgrade experiment

-- code review

Author: DmitriiBobreshev

src/Agent.Worker/ExecutionContext.cs

@@ -925,16 +925,18 @@ public void EmitHostNode20FallbackTelemetry(bool node20ResultsInGlibCErrorHost)
         // This overload is to handle specific types some other way.
         private void PublishTelemetry<T>(
             Dictionary<string, T> telemetryData,
-            string feature = "TaskHandler"
+            string feature = "TaskHandler",
+            bool IsAgentTelemetry = false
         )
         {
             // JsonConvert.SerializeObject always converts to base object.
-            PublishTelemetry((object)telemetryData, feature);
+            PublishTelemetry((object)telemetryData, feature, IsAgentTelemetry);
         }
 
         private void PublishTelemetry(
             object telemetryData,
-            string feature = "TaskHandler"
+            string feature = "TaskHandler",
+            bool IsAgentTelemetry = false
         )
         {
             var cmd = new Command("telemetry", "publish")
@@ -944,14 +946,14 @@ private void PublishTelemetry(
             cmd.Properties.Add("area", "PipelinesTasks");
             cmd.Properties.Add("feature", feature);
 
-            var publishTelemetryCmd = new TelemetryCommandExtension();
+            var publishTelemetryCmd = new TelemetryCommandExtension(IsAgentTelemetry);
             publishTelemetryCmd.Initialize(HostContext);
             publishTelemetryCmd.ProcessCommand(this, cmd);
         }
 
         public void PublishTaskRunnerTelemetry(Dictionary<string,string> taskRunnerData)
         {
-            PublishTelemetry(taskRunnerData);
+            PublishTelemetry(taskRunnerData, IsAgentTelemetry: true);
         }
 
         public void Dispose()

src/Agent.Worker/Telemetry/TelemetryCommandExtension.cs

@@ -21,6 +21,12 @@ public TelemetryCommandExtension()
             SupportedHostTypes = HostTypes.All;
             InstallWorkerCommand(new PublishTelemetryCommand());
         }
+        public TelemetryCommandExtension(bool IsAgentTelemetry = false)
+        {
+            CommandArea = "telemetry";
+            SupportedHostTypes = HostTypes.All;
+            InstallWorkerCommand(new PublishTelemetryCommand(IsAgentTelemetry: IsAgentTelemetry));
+        }
     }
 
     [CommandRestriction(AllowedInRestrictedMode = true)]
@@ -29,13 +35,20 @@ public sealed class PublishTelemetryCommand : IWorkerCommand
         public string Name => "publish";
         public List<string> Aliases => null;
 
+        public readonly bool IsAgentTelemetry = false;
+
+        public PublishTelemetryCommand(bool IsAgentTelemetry = false)
+        {
+            this.IsAgentTelemetry = IsAgentTelemetry;
+        }
+
         public void Execute(IExecutionContext context, Command command)
         {
             ArgUtil.NotNull(context, nameof(context));
             ArgUtil.NotNull(command, nameof(command));
 
             context.Variables.TryGetValue(Constants.Variables.Task.PublishTelemetry, out string publishTelemetryVar);
-            if (bool.TryParse(publishTelemetryVar, out bool publishTelemetry) && !publishTelemetry)
+            if (bool.TryParse(publishTelemetryVar, out bool publishTelemetry) && !publishTelemetry && !IsAgentTelemetry)
             {
                 return;
             }