Updated the validation to allow the image button to apply the tint co…

[vhugogarcia]

Description of Change

Updated the iOS validations to allow the Image button and image to re-apply the tint color when the source is updated via a page element event. Special thanks to v0idzz for providing a proposal solution.

Linked Issues

• Fixes #1196

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/pull/XYZ

Additional information

Additionally, I went head and updated a little the UI of the sample app for the Image Tint Color to reflect make it a little more clear and also added the sample of a change source image button, so it can be applied.

No documentation is required to be updated, since this was an iOS bug only. It has been tested on iOS.

[brminnick]

Thanks @vhugogarcia!!

And thank you SO MUCH for including a sample! I heavily use the sample app to validate PRs to ensure that all existing functionality continues to work, and this addition to the sample app will help ensure a future PR doesn't accidentally break it! ❤️🙌