`IRazorPageFactoryProvider.CreateFactory(relativePath)` should also take absolute paths

Currently, `IRazorPageFactoryProvider.CreateFactory(relativePath)` does not work if you pass it an absolute path to a view, like this:

```c#
var razorFactoryProvider = webApp.Services.GetRequiredService();

var viewPath = "c:/dev/MyMvcSolution/MyMvcProject/Views/SomeView.cshtml"; // <-- absolute path

var factoryResult = razorFactoryProvider.CreateFactory(path);

Console.WriteLine($"Success: {factoryResult.Success}"); // Success = false
```

However, if you give it a path that's relative to the project, like this:

```c#
var razorFactoryProvider = webApp.Services.GetRequiredService();

var viewPath = "Views/SomeView.cshtml"; // <-- relative path

var factoryResult = razorFactoryProvider.CreateFactory(path);

Console.WriteLine($"Success: {factoryResult.Success}"); // Success = true
```

It works fine.

Can the `CreateFactory()` method be modified to accept absolute file paths? Historically, `RazorFileSystem` could be used to convert absolute view paths to relative paths, but `RazorFileSystem` has been marked as obsolete in .NET 10. A quick fix for these woes would be to make `IRazorPageFactoryProvider.CreateFactory()` accept absolute paths.