[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, 0 insertions, 12 deletions

diff --git a/src/installer/corehost/cli/hostpolicy/deps_resolver.h b/src/installer/corehost/cli/hostpolicy/deps_resolver.h
index f2b27d4620a..d61a78c3179 100644
--- a/src/installer/corehost/cli/hostpolicy/deps_resolver.h
+++ b/src/installer/corehost/cli/hostpolicy/deps_resolver.h
@@ -14,7 +14,6 @@
 #include "deps_format.h"
 #include "deps_entry.h"
 #include "runtime_config.h"
-#include "bundle/runner.h"
 
 // Probe paths to be resolved for ordering
 struct probe_paths_t
@@ -186,17 +185,6 @@ public:
             static const pal::string_t s_empty;
             return s_empty;
         }
-        if (m_host_mode == host_mode_t::apphost)
-        {
-            if (bundle::info_t::is_single_file_bundle())
-            {
-                const bundle::runner_t* app = bundle::runner_t::app();
-                if (app->is_netcoreapp3_compat_mode())
-                {
-                    return app->extraction_path();
-                }
-            }
-        }
 
         return m_app_dir;
     }