Add prompt to choose between opening JSON settings file or folder

[farheen-shaikh530]

Summary of the Pull Request

This PR introduces a confirmation dialog that allows users to choose between opening the settings JSON file or the containing folder. This enhances user flexibility when accessing configuration files from the terminal.

Motivation

Previously, clicking "Open JSON" would directly open the file. This change adds user choice, improving usability and matching expectations for broader editing or navigation workflows.

References and Relevant Issues

Fixes #14410
Marked as [Good First Issue] in the Microsoft Terminal GitHub repository.

Detailed Description of the Pull Request / Additional comments

•	Modified the sui.OpenJson event handler inside TerminalPage.cpp.
•	Introduced Windows::UI::Popups::MessageDialog to show two options:
•	Open File
•	Open Folder
•	Based on user selection, the appropriate _LaunchSettings() method is called.
•	No breaking changes were introduced.

Validation Steps Performed

•	Verified dialog appears when clicking “Open JSON”
•	Confirmed “Open File” launches the correct settings JSON
•	Confirmed “Open Folder” opens the parent folder using DefaultsFile
•	Ensured no UI crashes or regressions
•	Code compiles and builds cleanly

Contributor License Agreement

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PR Checklist

• Closes #xxx
• Tests added/passed
• Documentation updated
  • If checked, please file a pull request on our docs repo and link it here: #xxx
• Schema updated (if necessary)

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[htcfreek]

My thoughts: Why a content dialog and not a button with secondary conmand? A button with secondary command to open the folder feels much user friendlier.

[farheen-shaikh530]

Hi team, I've cleaned up the PR and removed unrelated .vcxproj changes. Now, it only includes the intended logic for adding the confirmation dialog to choose between opening the settings file or its folder. Ready for your review. Thanks again for the guidance!

[farheen-shaikh530]

My thoughts: Why a content dialog and not a button with secondary conmand? A button with secondary command to open the folder feels much user friendlier.

Thank you for the feedback!
I agree that using a button with a secondary command could feel more seamless for users.
I initially went with a ContentDialog to align with how other prompts are handled in the Terminal UI and to make the choice explicit when clicking “Open JSON.” That said, I’m open to switching to a secondary command on the existing button if that better matches the UX expectations or existing UI patterns.
Let me know your thoughts — happy to iterate based on the team’s preference!