[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, 3 insertions, 3 deletions

diff --git a/src/installer/corehost/cli/ijwhost/ijwthunk.cpp b/src/installer/corehost/cli/ijwhost/ijwthunk.cpp
index 2b05bcfe708..b2329112162 100644
--- a/src/installer/corehost/cli/ijwhost/ijwthunk.cpp
+++ b/src/installer/corehost/cli/ijwhost/ijwthunk.cpp
@@ -73,7 +73,7 @@ bool patch_vtable_entries(PEDecoder& pe)
     error_writer_scope_t writer_scope(swallow_trace);
 
     size_t currentThunk = 0;
-    for (size_t i = 0; i < numFixupRecords; ++i)
+    for(size_t i = 0; i < numFixupRecords; ++i)
     {
         if (pFixupTable[i].Type & COR_VTABLE_PTRSIZED)
         {
@@ -81,7 +81,7 @@ bool patch_vtable_entries(PEDecoder& pe)
 
 #ifdef _WIN64
             DWORD oldProtect;
-            if (!VirtualProtect(pointers, (sizeof(BYTE*) * pFixupTable[i].Count), PAGE_READWRITE, &oldProtect))
+            if(!VirtualProtect(pointers, (sizeof(BYTE*) * pFixupTable[i].Count), PAGE_READWRITE, &oldProtect))
             {
                 trace::error(_X("Failed to change the vtfixup table from RO to R/W failed.\n"));
                 return false;
@@ -101,7 +101,7 @@ bool patch_vtable_entries(PEDecoder& pe)
 
 #ifdef _WIN64
             DWORD _;
-            if (!VirtualProtect(pointers, (sizeof(BYTE*) * pFixupTable[i].Count), oldProtect, &_))
+            if(!VirtualProtect(pointers, (sizeof(BYTE*) * pFixupTable[i].Count), oldProtect, &_))
             {
                 trace::warning(_X("Failed to change the vtfixup table from R/W back to RO failed.\n"));
             }