[XCUITests] Table View Cell 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 Table View Cell. An accessibility identifier was added to TableViewCell in debug that tracks the title, subtitle (if applicable), footer (if applicable), and accessory views (unread dot, leading images, trailing images). testSelection tests that selecting the single line cells will add an unread dot and that deselecting them will remove the unread dot. All other tests ensure that each cell has the correct accessibility identifier (with emphasis on each cell's accessory views.)

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)