acp_thread: If available, use git bash over powershell in terminal tool (#39466)

Release Notes:

- When git bash is installed, agents will now use that over powershell
when invoking terminal commands
4bd7ef8badLukas Wirth committed on 10/6/2025, 11:39:19 AM· committed by GitHubparentd1e2a1f
7 files changedLine totals unavailable