don't assume pending session to be null (#9770)

Author: LittleLittleCloud

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

@@ -98,7 +98,6 @@ async ValueTask<bool> TryCreatePendingSessionInternalAsync()
                     hotReloadSessionState.Session = projectHotReloadSession;
                     await projectHotReloadSession.ApplyLaunchVariablesAsync(environmentVariables, default);
 
-                    Assumes.True(_pendingSessionState is null, "Attempt to overwrite unprocessed pending hot reload sessions state.");
                     _pendingSessionState = hotReloadSessionState;
 
                     return true;