[CmpPal Extensions] Make about section in Command Palette customizable by extension developer

### Description of the new feature / enhancement

Add an ability to add custom text and links to an Command Palette extension settings page.

### Scenario when this would be used?

For adding linkt to privacy policy or other resources.

### Supporting information

_No response_

Start by locating the Command Palette extension settings entry point and how extension information is currently displayed. Confirm the intended custom text and link behavior, then verify that the content appears correctly on an extension settings page for a representative extension.

Written by the indexing model from the issue text.