ci: Disable KWSys ConsoleBuf test that breaks on Windows Terminal 1.22+

We've removed use of KWSys ConsoleBuf in post-4.0 commit 3e88020aed
(StdIo: Replace uses of KWSys ConsoleBuf with StdIo::Console,
2025-05-08).  There is no need to run its test anymore.

Windows-Terminal-Issue: https://github.com/microsoft/terminal/issues/18748