Strip folder name when copilot runs terminal commands

[DonJayamanne]

Originally reported here #290798 (comment)

[vs-code-engineering]

Hi @DonJayamanne. As a member of the team, you can help us triage this issue by referring to https://github.com/microsoft/vscode-copilot/wiki/Copilot-Inbox-Tracker and assigning an owner directly.

[DonJayamanne]

Closing as not planned as the commands are returned by LM, and stripping them for display purposes would be wrong as we'd like to see exact command invoked.
& even if we stripped there's no way to send the new command to Copilot CLI