[release/5.0-preview4] Revert processing bundles in framework (#35679)v5.0.0-preview.4.20251.6

This commit reverts:
Revert "Single-File: Process bundles in the framework (#34274)"
This reverts commit 78b303df8fbb242985d049a277d0d199cafd51b5.

Revert "Single-File Bundler: Add a FileSize test (#35149)"
This reverts commit 779588a509b81d909ac5d496c172949ec1f1ddcc.

*Customer Scenario*

Publishing apps as a self-contained single-file doesn't work as expected.

* Publish needs to generate hostpolicy and hostfxr separate from the single file bundle
* Cross-platform publishing is incorrect

*Problem*

Since Static-apphost is not yet ready, processing bundle content in hostpolicy means that  hostpolicy and hostfxr DLLs need to be separate from the bundle. This causes self-contained single-file apps to not be a "single file" temporarily. 

The change also requires supporting changes from the SDK, to publish hostfxr and hostpolicy as separate files, and to invoke HostModel library with arguments that facilitate cross-platform publishing.

*Solution*

To solve these, problem, this change reverts:

Revert "Single-File: Process bundles in the framework (#34274)" commit 78b303df8fbb242985d049a277d0d199cafd51b5.

and a dependent test-only change:

Revert "Single-File Bundler: Add a FileSize test (#35149)" commit 779588a509b81d909ac5d496c172949ec1f1ddcc.

*Risk*

Medium
The change is contained to only host components: apphost, hostpolicy, and hostfxr.
However, the change is big, and needs testing in runtime and SDK repos.

*Testing*

Manually tested the SDK by inserting apphost, hostfxr, hostpolicy, and hostmodel library from this build into the `dotnet/packs` preview-4 SDK from https://github.com/dotnet/sdk/pull/11518 build.

Verified that:
* Singlefile apps can be published and run OK for  { Windows, Linux, Osx } x {netcoreapp3.0, netcoreapp3.1, netcoreapp5.0} 
* Cross-targeting builds of single-file apps build and run OK (ex: built on Windos, run on Mac).

1 files changed, 12 insertions, 22 deletions

diff --git a/src/installer/test/Microsoft.NET.HostModel.Tests/AppHost.Bundle.Tests/BundledAppWithSubDirs.cs b/src/installer/test/Microsoft.NET.HostModel.Tests/AppHost.Bundle.Tests/BundledAppWithSubDirs.cs
index 33e05b5c050..59360c09f99 100644
--- a/src/installer/test/Microsoft.NET.HostModel.Tests/AppHost.Bundle.Tests/BundledAppWithSubDirs.cs
+++ b/src/installer/test/Microsoft.NET.HostModel.Tests/AppHost.Bundle.Tests/BundledAppWithSubDirs.cs
@@ -2,12 +2,11 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-using BundleTests.Helpers;
-using Microsoft.DotNet.Cli.Build.Framework;
-using Microsoft.NET.HostModel.Bundle;
-using Microsoft.DotNet.CoreSetup.Test;
 using System;
 using Xunit;
+using Microsoft.DotNet.Cli.Build.Framework;
+using BundleTests.Helpers;
+using Microsoft.DotNet.CoreSetup.Test;
 
 namespace AppHost.Bundle.Tests
 {
@@ -32,16 +31,11 @@ namespace AppHost.Bundle.Tests
                 .HaveStdOutContaining("Wow! We now say hello to the big world and you.");
         }
 
-        // BundleOptions.BundleNativeBinaries: Test when the payload data files are unbundled, and beside the single-file app.
-        // BundleOptions.BundleAllContent: Test when the payload data files are bundled and extracted to temporary directory. 
-        // Once the runtime can load assemblies from the bundle, BundleOptions.None can be used in place of BundleOptions.BundleNativeBinaries.
-        [InlineData(BundleOptions.BundleNativeBinaries)]
-        [InlineData(BundleOptions.BundleAllContent)]
-        [Theory]
-        public void Bundled_Framework_dependent_App_Run_Succeeds(BundleOptions options)
+        [Fact]
+        public void Bundled_Framework_dependent_App_Run_Succeeds()
         {
             var fixture = sharedTestState.TestFrameworkDependentFixture.Copy();
-            var singleFile = BundleHelper.BundleApp(fixture, options);
+            var singleFile = BundleHelper.BundleApp(fixture);
 
             // Run the bundled app (extract files)
             RunTheApp(singleFile);
@@ -50,13 +44,11 @@ namespace AppHost.Bundle.Tests
             RunTheApp(singleFile);
         }
 
-        [InlineData(BundleOptions.BundleNativeBinaries)]
-        [InlineData(BundleOptions.BundleAllContent)]
-        [Theory]
-        public void Bundled_Self_Contained_App_Run_Succeeds(BundleOptions options)
+        [Fact]
+        public void Bundled_Self_Contained_App_Run_Succeeds()
         {
             var fixture = sharedTestState.TestSelfContainedFixture.Copy();
-            var singleFile = BundleHelper.BundleApp(fixture, options);
+            var singleFile = BundleHelper.BundleApp(fixture);
 
             // Run the bundled app (extract files)
             RunTheApp(singleFile);
@@ -65,13 +57,11 @@ namespace AppHost.Bundle.Tests
             RunTheApp(singleFile);
         }
 
-        [InlineData(BundleOptions.BundleNativeBinaries)]
-        [InlineData(BundleOptions.BundleAllContent)]
-        [Theory]
-        public void Bundled_With_Empty_File_Succeeds(BundleOptions options)
+        [Fact]
+        public void Bundled_With_Empty_File_Succeeds()
         {
             var fixture = sharedTestState.TestAppWithEmptyFileFixture.Copy();
-            var singleFile = BundleHelper.BundleApp(fixture, options);
+            var singleFile = BundleHelper.BundleApp(fixture);
 
             // Run the app
             RunTheApp(singleFile);