Standardize license headers in TOML/YAML files

[pderrenger]

This PR updates all YAML file headers to use a standardized license format. 🔄

Changes:

• 📝 Standardized header: # Ultralytics 🚀 AGPL-3.0 License - https://ultralytics.com/license
• 🧹 Ensures consistent spacing after headers
• 🔍 Applies to all YAML files except those in venv

Learn more about Ultralytics licensing 📚

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Updated license references across various files for consistency and clarity.

📊 Key Changes

• Replaced the old license comment # Ultralytics YOLOv3 🚀, AGPL-3.0 license with the updated format:
  # Ultralytics 🚀 AGPL-3.0 License - https://ultralytics.com/license.
• Cleaned or clarified license references in issues templates, continuous integration (CI) workflows, data configuration files, model configuration files, and other project files.

🎯 Purpose & Impact

• 📝 Consistency: Ensures all files reflect the same format for the project's license reference.
• 🔗 Clarity: Includes a direct, visible link to the license details.
• ✅ Enhanced Communication: Better visibility and understanding of licensing terms, benefiting both contributors and users.
• 🚀 Impact: No functional changes to the code; purely cosmetic for ease of maintainability and compliance clarity.