Learn more link in Core Tools update notification should point to Core Tools documentation instead of the extension repository

[v-ruizh]

OS: Win 11 x64
Build Version: 1.22.1

Repro Steps:

1. Install Azure Functions Core Tools 4.13.0.
2. Open one function project in VS Code.
3. Observe the notification: Update your Azure Functions Core Tools (4.13.0) to the latest (4.13.2).
   
4. Click "Learn more" button.

Expect:
The Learn more link should direct users to Azure Functions Core Tools documentation or release notes.

Actual:
The link opens the Azure Functions extension GitHub repository: https://github.com/microsoft/vscode-azurefunctions#prerequisites.
Users are taken to the repository page and must manually locate relevant information.