[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, 6 insertions, 8 deletions

diff --git a/src/installer/corehost/cli/deps_entry.h b/src/installer/corehost/cli/deps_entry.h
index 2c66b1f0552..d06e2988aa3 100644
--- a/src/installer/corehost/cli/deps_entry.h
+++ b/src/installer/corehost/cli/deps_entry.h
@@ -52,19 +52,17 @@ struct deps_entry_t
     bool is_serviceable;
     bool is_rid_specific;
 
-    // Given a "base" dir, yield the file path within this directory or single-file bundle.
-    bool to_dir_path(const pal::string_t& base, bool look_in_bundle, pal::string_t* str) const;
+    // Given a "base" dir, yield the filepath within this directory or relative to this directory based on "look_in_base"
+    bool to_path(const pal::string_t& base, bool look_in_base, pal::string_t* str) const;
+
+    // Given a "base" dir, yield the file path within this directory.
+    bool to_dir_path(const pal::string_t& base, pal::string_t* str) const;
 
     // Given a "base" dir, yield the relative path in the package layout.
-    bool to_rel_path(const pal::string_t& base, bool look_in_bundle, pal::string_t* str) const;
+    bool to_rel_path(const pal::string_t& base, pal::string_t* str) const;
 
     // Given a "base" dir, yield the relative path with package name, version in the package layout.
     bool to_full_path(const pal::string_t& root, pal::string_t* str) const;
-
-private:
-    // Given a "base" dir, yield the filepath within this directory or relative to this directory based on "look_in_base"
-    // Returns a path within the single-file bundle, or a file on disk,
-    bool to_path(const pal::string_t& base, const pal::string_t& ietf_code, bool look_in_base, bool look_in_bundle, pal::string_t* str) const;
 };
 
 #endif // __DEPS_ENTRY_H_