Add check_git_status(..., branch='master') argument

[glenn-jocher]

Signed-off-by: Glenn Jocher [email protected]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improvement in YOLOv5's git status checking to support different branches.

📊 Key Changes

• Added a branch parameter to the check_git_status function to specify which branch to compare.
• Modified status checking code to compare the checked-out branch with the specified branch instead of assuming 'master'.

🎯 Purpose & Impact

• 🎨 Allows developers to check the git status against branches other than 'master', increasing flexibility.
• 🚀 Users working on different branches can now stay updated with the latest changes on those specific branches.
• 🌐 Opens the door for easier maintenance and development across multiple branches within the repository.