Platforms Impacted

• iOS
• visionOS
• macOS

Description of changes

Updating ccb group label accessiblity

• Add header accessibility trait
• Prevent label from scaling and add large content viewer

While I'm here, allow label font to be customizable

Verification

Visual Verification

Header	Large content viewer

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