Add UnconditionalSuppressMessage to fix IL2092

[jfversluis]

Description of Change

Adds a UnconditionalSuppressMessage attribute to ICommunityToolkitValueConverter.Convert and ICommunityToolkitValueConverter.ConvertBack to fix the IL2092 warnings that are currently emitted when using AOT on iOS.

Linked Issues

• Fixes [BUG] NativeAOT Trim warnings #2447

PR Checklist

• Has a linked Issue, and the Issue has been approved(bug) or Championed (feature/proposal)
• Has tests (if omitted, state reason in description)
• Has samples (if omitted, state reason in description)
• Rebased on top of main at time of PR
• Changes adhere to coding standard
• Documentation created or updated: https://github.com/MicrosoftDocs/CommunityToolkit/pulls

Additional information

See #2447 (comment)

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