Fix on PR close

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Update to GitHub Actions workflow to skip steps for closed PRs.

📊 Key Changes

• Modified event action echo to reflect correct terms (opened/closed).
• Added conditions to skip checkout, dependency installation, formatting, and commit steps if the PR is closed.
• Updated conditionals to halt action steps using github.event.action != 'closed' check.

🎯 Purpose & Impact

• Efficiency: Prevents unnecessary execution of actions when PRs are closed, saving time and resources.
• Accuracy: Corrects status terms in the action logs for better clarity.
• User Experience: Users will benefit from faster feedback loops during the development process, as the actions will now ignore redundant workflows on closed PRs.