feat(inspect): Imporve training job update progress

[ActiveChooN]

📝 Description

This PR adds model exporting message for the job progress status message and granular progress updates with on batch callback

• Provide a clear summary of the changes and the issue that has been addressed.
• 🛠️ Fixes # (issue number)

✨ Changes

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• 🐞 Bug fix (non-breaking change which fixes an issue)
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• 📚 Documentation update
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[Copilot]

Pull request overview

This PR improves the granularity of training job progress updates by adding batch-level progress tracking and clarifying the model export phase. The changes enable more frequent progress updates during training and explicitly communicate when model export begins.

Key Changes:

• Added batch-level progress tracking through on_train_batch_end callback
• Added "exporting model" status message before model export

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
application/backend/src/utils/callbacks.py	Implements batch-end callback for granular progress updates during training
application/backend/src/services/training_service.py	Adds status message to indicate model export phase

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