skip windows GPU check if changes only in doc (#13248)
### Description
Use Path filter and fake workflow to skip windows GPU check if there's
only changes in doc.
Refs:
https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/defining-the-mergeability-of-pull-requests/troubleshooting-required-status-checks#handling-skipped-but-required-checks
The fake github yaml is generated by code.
### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
###verifications:###
In this PR:
since the win-gpu-ci-pipeline.yml and .github are updated, so the real
Windows GPU workflows are always triggered.
in #13256
To avoid update win-gpu-ci-pipleline.yml, I added the path filter in
devops page. the fake win GPU workflows triggered, and the real
workflows are skipped.
