Enrich User-Agent Header in gRPC Metadata to indicate Client or Worker as caller

Author: YunchuWang

src/Client/AzureManaged/DurableTaskSchedulerClientOptions.cs

@@ -7,6 +7,7 @@
 using Grpc.Core;
 using Grpc.Net.Client;
 using Microsoft.DurableTask;
+using Microsoft.DurableTask.Client;
 
 namespace Microsoft.DurableTask;
 
@@ -98,7 +99,7 @@ this.Credential is not null
                 metadata.Add("taskhub", taskHubName);
 
                 // Add user agent header with durabletask-dotnet and DLL version from util
-                metadata.Add("user-agent", $"{DurableTaskUserAgentUtil.GetUserAgent()}");
+                metadata.Add("user-agent", $"{DurableTaskUserAgentUtil.GetUserAgent(nameof(DurableTaskClient))}");
                 if (cache == null)
                 {
                     return;

src/Worker/AzureManaged/DurableTaskSchedulerWorkerOptions.cs

@@ -7,6 +7,7 @@
 using Grpc.Core;
 using Grpc.Net.Client;
 using Microsoft.DurableTask;
+using Microsoft.DurableTask.Worker.Hosting;
 
 namespace Microsoft.DurableTask;
 
@@ -103,7 +104,7 @@ this.Credential is not null
             {
                 metadata.Add("taskhub", taskHubName);
                 // Add user agent header with durabletask-dotnet and DLL version from util
-                metadata.Add("user-agent", $"{DurableTaskUserAgentUtil.GetUserAgent()}");
+                metadata.Add("user-agent", $"{DurableTaskUserAgentUtil.GetUserAgent(nameof(DurableTaskWorker))}");
                 metadata.Add("workerid", this.WorkerId);
                 if (cache == null)
                 {