Skip extra hostfxr logic

What we were doing was setting the AppContext data such that the HOSTFXR_PATH pointed to the installed root location. We don't need to do that, the hostfxr interop(ped) API already points to the dotnet root location within which we want to resolve the hostfxr.

Author: nagilson

src/Installer/dnup/ArchiveInstallationValidator.cs

@@ -75,10 +75,8 @@ private bool ValidateWithHostFxr(string installRoot, ReleaseVersion resolvedVers
     {
         try
         {
-            ConfigureHostFxrResolution(installRoot);
-
             var bundleProvider = new NETBundlesNativeWrapper();
-            NetEnvironmentInfo environmentInfo = bundleProvider.GetDotnetEnvironmentInfo(installRoot);
+            NetEnvironmentInfo environmentInfo = bundleProvider.GetDotnetEnvironmentInfo(installRoot); // Could we use get_available_sdks instead to improve perf?
 
             if (component == InstallComponent.SDK)
             {
@@ -104,42 +102,4 @@ private bool ValidateWithHostFxr(string installRoot, ReleaseVersion resolvedVers
             return false;
         }
     }
-
-    private static void ConfigureHostFxrResolution(string installRoot)
-    {
-        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
-        {
-            return;
-        }
-
-        if (AppContext.GetData(HostFxrRuntimeProperty) is not null)
-        {
-            return;
-        }
-
-        string? hostFxrPath = FindHostFxrLibrary(installRoot);
-        if (hostFxrPath is not null)
-        {
-            AppContext.SetData(HostFxrRuntimeProperty, hostFxrPath);
-        }
-    }
-
-    private static string? FindHostFxrLibrary(string installRoot)
-    {
-        string hostFxrDirectory = Path.Combine(installRoot, "host", "fxr");
-        if (!Directory.Exists(hostFxrDirectory))
-        {
-            return null;
-        }
-
-        string libraryName = RuntimeInformation.IsOSPlatform(OSPlatform.Windows)
-            ? "hostfxr.dll"
-            : RuntimeInformation.IsOSPlatform(OSPlatform.OSX)
-                ? "libhostfxr.dylib"
-                : "libhostfxr.so";
-
-        return Directory.EnumerateFiles(hostFxrDirectory, libraryName, SearchOption.AllDirectories)
-            .OrderByDescending(File.GetLastWriteTimeUtc)
-            .FirstOrDefault();
-    }
 }