Fail steps on Windows with StdoutPath or StderrPath set
Fail steps on Windows with StdoutPath or StderrPath set

closes #5174

This fixes the release pipeline issue with building `cmd/entrypoint` on Windows, and returns an error if `StdoutPath` or `StderrPath` are specified in a Windows step.

Signed-off-by: Andrew Bayer <584a3be2b8e7a970b37393618731e9be5df24fde@gmail.com>

tektoncd/pipeline,tektoncd/pipeline