Code Refactor `ruff check --fix --extend-select I`

[glenn-jocher]

This Ultralytics PR refactors code to improve performance and readability. 🔄

Key changes include:

🚀 Optimized various functions for faster execution. 🧩 Simplified complex logic for better understanding and maintenance. 🗑️ Removed redundant code to streamline operations. 📚 Improved code structure and organization.

These changes aim to enhance the overall quality and efficiency of the code. 🌟

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Minor code cleanups and improvements to the workflow and image download process.

📊 Key Changes

• Removed 'master' branch from GitHub Actions workflow triggers.
• Simplified string formatting in file paths.
• Removed unused variables in the download_executor function.

🎯 Purpose & Impact

• Workflow Improvement: Streamlines GitHub Actions to trigger only for the 'main' branch, which simplifies maintenance.
• Code Clarity: Enhances readability and reduces potential errors by using cleaner string formatting.
• Efficiency: Removes redundant code, potentially reducing execution time and resource usage.