Populate the GitHub Copilot Tool Tips page with community tools and extensions

[rvanmaanen]

Add entries for community-built tools and extensions to the Tool Tips custom page (/github-copilot/tool-tips). Source candidates from the GitHub Community links library and other known resources.

First candidates (examples):

• GitHub Copilot Model Notifier — notifies users about GitHub Copilot model updates.
• Additional tools/extensions from the SharePoint GitHub links library that are relevant to Copilot usage.

Implementation:

• Review the GitHub Community links library for tools that fit the Tool Tips page.
• Add each tool to the tool-tips.json data file with an appropriate title, description, category, and link.
• The Tool Tips page is rendered by GitHubCopilotToolTips.razor using data from the ToolTipsPageData model via GET /api/custom-pages/tool-tips.
• Consider making this a recurring activity — periodically check the links library for new tools to add.