Add Prettier for YAML formatting to Ultralytics Actions

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improved GitHub Actions workflow for better code formatting and management.

📊 Key Changes

• Pull Request Trigger Update: Changed from pull_request_target to pull_request to enhance workflow security and functionality.
• Formatting Enhancements:
  • Separated Markdown and YAML formatting by introducing a new prettier flag specifically for YAML files.

🎯 Purpose & Impact

• Enhanced Security and Compatibility: The trigger update makes the workflow more secure and functional by applying the correct permissions model, minimizing potential security risks.
• Improved Code Quality: By distinguishing between Markdown and YAML formatting, the repository ensures more precise and tailored formatting, leading to cleaner and more readable code.
• Broader Impact: These changes contribute to maintaining a high standard of code quality and workflow efficiency in the Ultralytics YOLOv5 project, positively affecting both contributors and end users by ensuring the codebase remains easy to understand, use, and contribute to. 🚀