fix build error

src/Microsoft.VisualStudio.ProjectSystem.Managed.VS/ProjectSystem/VS/HotReload/IProjectHotReloadSessionCallback.cs

@@ -1,5 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. See the LICENSE.md file in the project root for more information.
 
+using System.Diagnostics;
 using Microsoft.VisualStudio.HotReload.Components.DeltaApplier;
 
 namespace Microsoft.VisualStudio.ProjectSystem.VS.HotReload
@@ -19,6 +20,12 @@ public interface IProjectHotReloadSessionCallback
 
     internal interface IProjectHotReloadSessionCallback2 : IProjectHotReloadSessionCallback
     {
+        public UnconfiguredProject? Project { get; }
+
+        public Process? Process { get; set; }
+
+        public IProjectHotReloadSession? Session { get; set; }
+
         Task<bool> RestartProjectAsync(bool isRunningUnderDebug, CancellationToken cancellationToken);
     }
 }

src/Microsoft.VisualStudio.ProjectSystem.Managed.VS/ProjectSystem/VS/HotReload/ProjectHotReloadSession.cs

@@ -300,7 +300,7 @@ private void EnsureDeltaApplierforSession()
 
         public ValueTask<int?> GetTargetLocalProcessIdAsync(CancellationToken cancellationToken)
         {
-            if (_callback is HotReloadState hotReloadState)
+            if (_callback is IProjectHotReloadSessionCallback2 hotReloadState)
             {
                 return new ValueTask<int?>(hotReloadState.Process?.Id);
             }
@@ -310,7 +310,7 @@ private void EnsureDeltaApplierforSession()
 
         public ValueTask<string?> GetProjectFullPathAsync(CancellationToken cancellationToken)
         {
-            if (_callback is HotReloadState hrs)
+            if (_callback is IProjectHotReloadSessionCallback2 hrs)
             {
                 return new ValueTask<string?>(hrs.Project?.FullPath);
             }