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

[michael-hawker]

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

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

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