[XCUITests] Add test reruns to iOS tests

[joannaquu]

Platforms Impacted

• iOS
• macOS

Description of changes

Binary change:

File	Before	After	Delta
libFluentUI.a	28,869,912 bytes	28,869,912 bytes	0 bytes

When run in CI, XCUITests have experienced random failures that are unique each time and not the result of a bug. Reruns will usually fix the issue and allow the PR check to pass. This has been reported by others see link and the only real solution is to rerun tests. This PR enables tests reruns on individual tests so that we don't need to manually rerun the whole PR check.

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