chore: add log message for protected default branch case

- Add log message for protected default branch case. - It helps us understand in the workflow logs why a PR was created here instead of a commit. <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Added an informational log message to notify users when the default branch is protected prior to pull request creation, providing better visibility into the process workflow. _{✏️ Tip: You can customize this high-level summary in your review settings.} <!-- end of auto-generated comment: release notes by coderabbit.ai -->