## Summary of the Pull Request
Improves the UI for the Profile.Icon setting by adding an "Icon Type"
combo box. This allows the user to pick from multiple options:
- None: sets the icon to "none" which is interpreted as no icon
- Built-in Icon: presents a combo box that enumerates the Segoe MDL 2
assets
- Emoji: presents a text box with a hint to open the emoji picker
- File: presents a text box to input the path of the image to use

Additionally, the rendered icon is displayed in the setting container.
If "none", "none" is presented to the user (localized).
✅ Verified as accessible using Accessibility Insights
#10000