[Bug]: Update dep on `github.copilot` to `github.copilot-chat`

[caohai]

Description

github.copilot is being deprecated and will be replaced with github.copilot-chat, we currently have a hard-coded dep on github.copilot.

https://code.visualstudio.com/blogs/2025/11/04/openSourceAIEditorSecondMilestone

Steps to Reproduce

N/A

Affected Area

• Connection dialog (SQL Server | Azure browse/Fabric browse)
• Query results panel
• Query editor
• Object Explorer
• Table Designer
• Schema Compare
• Schema Designer
• Local SQL Server Container provisioning
• SQL database in Fabric provisioning
• GitHub Copilot integration
• Query Plan Visualizer
• Other (please describe below)

If you selected "Other", please describe the affected area

No response

Environment Information

N/A

Confirmation

• I have searched existing issues and couldn't find a match
• I want to work on this issue

[caohai]

closed by #20462