[Fluent 2 iOS] TableViewCell colors update (2/2)

[laminesm]

Platforms Impacted

• [x] iOS
• [ ] macOS

Description of changes

As we are trying to move away from Colors.swift, the Colors extension was removed from TableViewCell. Some of the colors in the Table struct were used by other controls in fluent. In fact, PersonaListView, TableViewHeaderFooterTitleView & PopupMenuItemCell had dependencies to some of these colors and they were all updated to use their appropriate color tokens instead. The Objective-C colors were changed into functions that take in a FluentTheme and output the right token.

Verification

Before	After

Pull request checklist

This PR has considered:

• [x] 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)

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