Published unpackaged, Single File no longer launches in 1.8

### Describe the bug

I’ve recently updated my project from version 1.7.5 (1.7.251014001) to 1.8.2 (1.8.251003001) and noticed that the published single-file app no longer launched.

The following are repro projects:

[PublishNotLaunch1.7.zip](https://github.com/user-attachments/files/23403651/PublishNotLaunch1.7.zip)

[PublishNotLaunch1.8.zip](https://github.com/user-attachments/files/23403653/PublishNotLaunch1.8.zip)

I got the following message when I try to run the published single file:

`PublishNotLaunch.exe: WinRT originate error - 0x80004005 : ‘Cannot locate resource from ‘ms-appx:///MainWindow.xaml’.’.`

Therefore, I copied ‘MainWindow.xbf” file along with the published single file exe and confirmed the app launched.

It may same reason as [this bug](https://github.com/microsoft/microsoft-ui-xaml/issues/10803), which generated code points wrong resource path might cause this.

I could copy all XBF files to work around this issue, but it would be nice if other way to work around this issue yet still create a single exe file.

Thank you!

### Why is this important?

This issue prevents the project from being updated to version 1.8.

### Steps to reproduce the bug

1. Open [PublishNotLaunch1.8.zip](https://github.com/user-attachments/files/23403653/PublishNotLaunch1.8.zip)
2. Publish the project
3. Run published single exe file (PublishNotLaunch.exe)

### Actual behavior

App doesn't launch

### Expected behavior

App must launch

### Screenshots

_No response_

### NuGet package version

WinUI 3 - Windows App SDK 1.8.2: 1.8.251003001

### Windows version

Windows 11 (24H2): Build 26100

### Additional context

_No response_

Start by opening PublishNotLaunch1.7.zip and PublishNotLaunch1.8.zip, publishing both projects, and comparing their single-file outputs. Inspect the generated resource paths and packaging behavior around MainWindow.xaml and MainWindow.xbf; done means the 1.8 published unpackaged executable launches without copying XBF files beside it.

Written by the indexing model from the issue text.