Add back using Microsoft.AspNetCore.InternalTesting; statements

Co-authored-by: radical <[email protected]>

Author: Copilot

src/Mvc/test/Mvc.FunctionalTests/RazorBuildTest.cs

@@ -5,6 +5,7 @@
 using System.Net.Http;
 using System.Reflection;
 using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.InternalTesting;
 using Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation;
 using Microsoft.AspNetCore.Mvc.Testing;
 using Microsoft.AspNetCore.TestHost;

src/Mvc/test/Mvc.FunctionalTests/RazorRuntimeCompilationHostingStartupTest.cs

@@ -4,6 +4,7 @@
 using System.Net.Http;
 using System.Reflection;
 using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.InternalTesting;
 
 using Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation;
 using Microsoft.AspNetCore.Mvc.Testing;