Enable cabgen CI PR check to live branch

[xmdanni]

PR Summary

https://dev.azure.com/ceapex/Engineering/_workitems/edit/236395

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributors guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

Learn Build status updates of commit 3ca782e:

✅ Validation status: passed

File	Status	Preview URL	Details
cabgen-bootstrap.yml	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel