refactor trace constants usage

Author: satvu

src/DotNetWorker.Core/Properties/AssemblyInfo.cs

@@ -11,4 +11,3 @@
 [assembly: InternalsVisibleTo("Microsoft.Azure.Functions.Worker.Grpc, PublicKey=00240000048000009400000006020000002400005253413100040000010001005148be37ac1d9f58bd40a2e472c9d380d635b6048278f7d47480b08c928858f0f7fe17a6e4ce98da0e7a7f0b8c308aecd9e9b02d7e9680a5b5b75ac7773cec096fbbc64aebd429e77cb5f89a569a79b28e9c76426783f624b6b70327eb37341eb498a2c3918af97c4860db6cdca4732787150841e395a29cfacb959c1fd971c1")]
 [assembly: InternalsVisibleTo("Microsoft.Azure.Functions.Worker.Tests, PublicKey=00240000048000009400000006020000002400005253413100040000010001005148be37ac1d9f58bd40a2e472c9d380d635b6048278f7d47480b08c928858f0f7fe17a6e4ce98da0e7a7f0b8c308aecd9e9b02d7e9680a5b5b75ac7773cec096fbbc64aebd429e77cb5f89a569a79b28e9c76426783f624b6b70327eb37341eb498a2c3918af97c4860db6cdca4732787150841e395a29cfacb959c1fd971c1")]
 [assembly: InternalsVisibleTo("Microsoft.Azure.Functions.Tests.TestUtility, PublicKey=00240000048000009400000006020000002400005253413100040000010001005148be37ac1d9f58bd40a2e472c9d380d635b6048278f7d47480b08c928858f0f7fe17a6e4ce98da0e7a7f0b8c308aecd9e9b02d7e9680a5b5b75ac7773cec096fbbc64aebd429e77cb5f89a569a79b28e9c76426783f624b6b70327eb37341eb498a2c3918af97c4860db6cdca4732787150841e395a29cfacb959c1fd971c1")]
-[assembly: InternalsVisibleTo("Microsoft.Azure.Functions.Worker.OpenTelemetry, PublicKey=00240000048000009400000006020000002400005253413100040000010001005148be37ac1d9f58bd40a2e472c9d380d635b6048278f7d47480b08c928858f0f7fe17a6e4ce98da0e7a7f0b8c308aecd9e9b02d7e9680a5b5b75ac7773cec096fbbc64aebd429e77cb5f89a569a79b28e9c76426783f624b6b70327eb37341eb498a2c3918af97c4860db6cdca4732787150841e395a29cfacb959c1fd971c1")]

src/DotNetWorker.OpenTelemetry/BaggageMiddleware.cs

@@ -5,7 +5,6 @@
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using Microsoft.Azure.Functions.Worker.Middleware;
-using Microsoft.Azure.Functions.Worker.Diagnostics;
 using OpenTelemetry;
 
 namespace Microsoft.Azure.Functions.Worker.OpenTelemetry
@@ -14,7 +13,7 @@ internal class BaggageMiddleware : IFunctionsWorkerMiddleware
     {
         public async Task Invoke(FunctionContext context, FunctionExecutionDelegate next)
         {
-            if (context.Items.TryGetValue(TraceConstants.InternalKeys.BaggageKeyName, out var value) &&
+            if (context.Items.TryGetValue(TraceConstants.BaggageKeyName, out var value) &&
                 value is IEnumerable<KeyValuePair<string, string>> dict)
             {
                 foreach (var kv in dict)

src/DotNetWorker.OpenTelemetry/TraceConstants.cs

@@ -0,0 +1,10 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT License. See License.txt in the project root for license information.
+
+namespace Microsoft.Azure.Functions.Worker.OpenTelemetry
+{
+    internal static class TraceConstants
+    {
+        public const string BaggageKeyName = "AzureFunctions_TraceContext_Baggage";
+    }
+}