`[UIThreadTestMethod]` doesn't forward `[Ignore]` for test to cause test to be ignored when running tests...

### Describe the bug

Found this out when trying to remove a test from our matrix: https://github.com/CommunityToolkit/Windows/pull/174

Apparently, it wasn't actually removed as the `[UIThreadTestMethod]` doesn't forward the `[Ignore]` attribute over to the generated test.

### Steps to reproduce

```text
1. Take a test with a `[UIThreadTestMethod]` attribute
2. Add `[Ignore]` to method
```

### Expected behavior

Expect generated test to also have `[Ignore]` on it.

### Screenshots

_No response_

### Code Platform

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

### 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 11 21H2 (Build 22000)
- [ ] Other (specify)

### Other Windows Build number

_No response_

### App minimum and target SDK version

- [ ] Windows 10, version 1809 (Build 17763)
- [ ] Windows 10, version 1903 (Build 18362)
- [ ] Windows 10, version 1909 (Build 18363)
- [ ] Windows 10, version 2004 (Build 19041)
- [ ] Other (specify)

### Other SDK version

_No response_

### Visual Studio Version

_No response_

### Visual Studio Build Number

_No response_

### Device form factor

_No response_

### Additional context

_No response_

### Help us help you

Yes, but only if others can assist.

Start by locating the implementation of [UIThreadTestMethod] and how it generates tests. Reproduce the issue with a test carrying [Ignore], then verify that the generated test is also ignored when the test suite runs.

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