Remove empty #if (#49758)

Author: Youssef1313

src/Cli/dotnet/Commands/Test/IPC/Serializers/CommandLineOptionMessagesSerializer.cs

@@ -1,9 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-#if NETCOREAPP
-#endif
-
 using System.Diagnostics;
 using Microsoft.DotNet.Cli.Commands.Test.IPC.Models;