Error CS1504 Due to Disabling IncludePackageReferencesDuringMarkupCompilation

### Description

I am writing to report an issue encountered when disabling the `IncludePackageReferencesDuringMarkupCompilation` feature in a WPF project setup. The problem arises during the build process when XAML files are referenced across projects and added as links.

Disabling the `IncludePackageReferencesDuringMarkupCompilation` feature leads to the following issues:
1. When referencing XAML files from another project and adding them as links, the build process fails with error CS1504.
2. The generated `g.cs` files from XAML contain incorrect relative file paths in the `#pragma checksum` directive, causing the build to fail.

### Reproduction Steps

1. Create two WPF projects:
- A WPF Library project.
- A WPF Application project.
2. In the WPF Library project, add a user control named `MyUserControl`.
3. In the WPF Application project, reference the `MyUserControl.xaml` and `MyUserControl.xaml.cs` files using the following code:

```xml

MSBuild:Compile


```

Disable the `IncludePackageReferencesDuringMarkupCompilation` feature in the WPF Application project by modifying its `.csproj` file as shown below:

```xml

WinExe
net9.0-windows
enable
enable
true

False

MSBuild:Compile

```

You can find my repro project in [github](https://github.com/lindexi/lindexi_gd/tree/ee493914d4ac77e06bf6ac789ad84a0e8452be76/WPFDemo/TestIncludePackageReferencesDuringMarkupCompilation)

### Expected behavior

The build process should correctly handle XAML file references and generate accurate paths in the `g.cs` files, even with the `IncludePackageReferencesDuringMarkupCompilation` feature disabled.

I would appreciate your assistance in investigating this issue and providing a resolution or workaround.

Thank you for your attention to this matter.

### Actual behavior

With the `IncludePackageReferencesDuringMarkupCompilation` feature disabled, attempting to build the WPF Application project results in the following error:

```
obj\Debug\net9.0-windows\MyUserControl.g.cs(59,21,59,41): error CS1504: Cannot open source file "MyUserControl.xaml" -- Could not find file
```

This error indicates that the generated `g.cs` file contains an incorrect relative path for `MyUserControl.xaml`, leading to a build failure.

The first line code content of MyUserControl.g.cs:

```csharp
#pragma checksum "MyUserControl.xaml" "{ff1816ec-aa5e-4d10-87f7-6f4963833460}" "36731363E365869F8481967B94B2EC18BAB0FBB1"

```

### Regression?

_No response_

### Known Workarounds

_No response_

### Impact

_No response_

### Configuration

_No response_

### Other information

Reference:

- https://github.com/dotnet/wpf/issues/10068#issuecomment-2476304964
- https://github.com/dotnet/wpf/issues/8128
- https://github.com/dotnet/wpf/issues/4311

Reference https://github.com/dotnet/wpf/pull/7556