Implement extension method for NavigatedFromEventArgs

[JamesBrooksbankIceland]

From parent page when calling a popup, when the onnavigatedfrom event, check args if the destination is a popup page.

Unit tests implemented

Sample code applied

Description of Change

Added an extension method to OnNavigatedFrom event which checks if the destination page is a popup and if so returns true.

Linked Issues

• Fixes Extend NavigatedFromEventArgs from OnNavigatedFrom to allow determine if DestinationPage is Popup #2927

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
  Update to document for extension IsDestinationPageACommunityToolkitPo… MicrosoftDocs/CommunityToolkit#605

Additional information

Tested on Android.

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[bijington]

@JamesBrooksbankIceland This generally looks good, thank you for it! Only one comment in the code. I have a question outside of the changes though. Could/should we also introduce an extension to know whether we are navigating from a popup? I think it could be of benefit but keen to hear from others

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