AdvancedCollectionView sorting does not support sub-property

### Describe the bug

`CsvModels.SortDescriptions.Add(new SortDescription("Sub.Sort", SortDirection.Descending));`

Sorting of sub-property is not supported

[SortForSubPropertyDemo.zip](https://github.com/user-attachments/files/18507120/SortForSubPropertyDemo.zip)

### Steps to reproduce

```text
I have uploaded the demo
```

### Expected behavior

Adding sub-property to sort will result in an error

### Screenshots


### Code Platform

- [ ] UWP
- [x] WinAppSDK / WinUI 3
- [ ] Web Assembly (WASM)
- [ ] Android
- [ ] iOS
- [ ] MacOS
- [ ] Linux / GTK

### Windows Build Number

- [x] Windows 10 1809 (Build 17763)
- [ ] Windows 10 1903 (Build 18362)
- [ ] Windows 10 1909 (Build 18363)
- [ ] Windows 10 2004 (Build 19041)
- [ ] Windows 10 20H2 (Build 19042)
- [ ] Windows 10 21H1 (Build 19043)
- [ ] Windows 10 21H2 (Build 19044)
- [ ] Windows 10 22H2 (Build 19045)
- [ ] Windows 11 21H2 (Build 22000)
- [ ] Other (specify)

### Other Windows Build number

_No response_

### App minimum and target SDK version

- [x] Windows 10, version 1809 (Build 17763)
- [ ] Windows 10, version 1903 (Build 18362)
- [ ] Windows 10, version 1909 (Build 18363)
- [ ] Windows 10, version 2004 (Build 19041)
- [ ] Windows 10, version 2104 (Build 20348)
- [ ] Windows 11, version 22H2 (Build 22000)
- [ ] Other (specify)

### Other SDK version

_No response_

### Visual Studio Version

2022

### Visual Studio Build Number

_No response_

### Device form factor

Desktop

### Additional context

_No response_

### Help us help you

No, I'm unable to contribute a solution.

Inizia aprendo l’archivio allegato SortForSubPropertyDemo.zip e riproduci il problema usando AdvancedCollectionView con il SortDescription annidato mostrato. Segui il punto di ingresso dell’ordinamento partendo da questa riproduzione e verifica, come controllo finale, che l’ordinamento per Sub.Sort in ordine decrescente funzioni senza il problema segnalato.

Scritto dal modello di indicizzazione a partire dal testo della issue.