Make sure best.pt model file is preserved ClearML

[thepycoder]

Adresses #9251
There are 2 model upload point in the code. One of them did not have the necessary argument to preserve the model file.

🛠️ PR Summary

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🌟 Summary

Enhanced ClearML logging behavior in YOLOv5 training callbacks.

📊 Key Changes

• Modified the on_train_end method within the logging utilities.
• Added an auto_delete_file=False parameter to the ClearML update_output_model call to prevent automatic deletion of model files.

🎯 Purpose & Impact

• 🎯 Purpose: To ensure that the model files are retained and not automatically deleted when the ClearML task concludes, providing more consistent model management within the YOLOv5 training process.
• 🎯 Impact: Users integrating YOLOv5 with ClearML will have a more reliable and explicit handling of their output models, reducing the risk of unintentional data loss.