Update check_requirements() with cmds=() argument

[glenn-jocher]

Refactor TRT Autoinstall via check_requirements() upgrades.

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improved dependency management in YOLOv5 export process to TensorRT.

📊 Key Changes

• Removed manual install attempts of tensorrt within export.py when not found.
• Added cmds parameter to check_requirements function in general.py to handle custom install commands for specific packages.
• Updated check_requirements to execute custom install command according to the package index.

🎯 Purpose & Impact

• 🎨 Streamlines the dependency check and installation process, making it more robust and maintainable.
• 📦 Supports custom install commands for dependencies, allowing for more flexibility when installing specific packages like nvidia-tensorrt.
• 🚀 Potentially reduces errors and manual intervention when users set up their environment for exporting YOLOv5 models to TensorRT format, leading to a smoother user experience.