Update Model methods

[hassaanfarooq01]

• Update Model methods accordingly server model retrieve endpoint

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhanced model status checks and streamlined URL retrieval processes in Ultralytics Hub SDK.

📊 Key Changes

• Replaced hasLastWeights with status == "training" for resumability check.
• Updated has_best_weights check to depend on training status and weights presence.
• Swapped isTrained with status == "trained" to determine training status.
• Replaced architecture retrieval from a nested lineage object with direct cfg attribute access.
• Simplified dataset URL retrieval by utilizing direct data access instead of an HTTP request.
• Streamlined weight URL retrieval logic with direct attribute access, handling weight == "last" separately.

🎯 Purpose & Impact

• Improved Clarity: Changing status checks aligns model property methods with clearer, centralized status values.
• Faster Performance: Direct attribute access for configuration and URLs reduces the need for HTTP requests, speeding up operations.
• Simpler Codebase: The code is simplified, making it easier to maintain and less prone to errors.
• Enhanced User Experience: These changes lead to quicker responses and more intuitive interactions for SDK users, facilitating smoother model management within Ultralytics' ecosystem.