[Test] XmlToXamlTest NamespacedControl is broken

### Describe the bug

This is a desired behavior test which currently doesn't pass. The test is assumed to be proper, but the underlying functionality is broken.

Basically, the mapping between the XML document and the live XAML visual tree doesn't work if the control is using an XML namespace like `muxc:` for instance.

This is needed for better functionality in other parts of XAML Studio like the #44.

### Steps to reproduce

```text
1. Remove [Ignore] from NamespacedControl_XmlToXamlTest
2. Run test...
```

### Expected behavior

Test should pass

### Screenshots

_No response_

### Windows Build Number

- [ ] 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)
- [ ] Windows 11 22H2 (Build 22621)
- [ ] Windows 11 23H2 (Build 22631)
- [ ] Windows 11 24H2 (Build 26100)
- [ ] Windows 11 25H2 (Build 26200)
- [ ] Windows 11 26H1 (Build 28000)
- [ ] Other (specify)

### Other Windows Build number

_No response_

### Additional context

Disabled this test to get the CI working with a clean test pass, had added this before as knew was a broken scenario.

### Help us help you

Yes, but only if others can assist.