[XCUITests] Notification View tests

[joannaquu]

Platforms Impacted

• iOS
• macOS

Description of changes

Binary change:

File	Before	After	Delta
libFluentUI.a	28,875,336 bytes	28,875,336 bytes	0 bytes

Added targeted UI tests for Notification View. An accessibility identifier was added to NotificationView in debug that tracks the Notification's title, message, image, action button, style, and flexibility (for toast notifications only). Tests were then designed to test each part of Notification View. For example, when show default dismiss button is enabled and there is no action button title, there should be a dismiss default button, if set trailing image is enabled and there is no action button title, there should be a trailing image, etc.

Verification

Pull request checklist

This PR has considered:

• Light and Dark appearances
• iOS supported versions (all major versions greater than or equal current target deployment version)
• VoiceOver and Keyboard Accessibility
• Internationalization and Right to Left layouts
• Different resolutions (1x, 2x, 3x)
• Size classes and window sizes (iPhone vs iPad, notched devices, multitasking, different window sizes, etc)
• iPad Pointer interaction
• SwiftUI consumption (validation or new demo scenarios needed)
• Objective-C exposure (provide it only if needed)

Microsoft Reviewers: Open in CodeFlow