Use transformer for model files

[snipe]

This switches us to using transformer methods for asset model files.

[what-the-diff]

PR Summary

• Simplified Data Fetching in AssetModelFilesController
  A restructuring has been made on how we fetch asset uploads, making it simpler and more efficient by utilizing AssetModelsTransformer. Additionally, a small change on parameter naming enhances readability.

• New Feature in AssetModelsTransformer
  A new functionality has been added, aptly named transformAssetModelFiles. This function transforms the data of asset uploads into a systematic array format.

• Improved File Information Extraction
  The transformAssetModelFile method has been revised to extract more detailed file information, resulting in a comprehensive and structured response.

• Updated API Response Structure in Tests
  Our test expectations have been refreshed to match our latest application changes. The expected JSON structure now includes rows and total instead of the previous payload.

• Consistent JSON Structure Checks
  To ensure our data integrity, all API response tests now cross-check with the revamped JSON structure that includes status and messages. This makes sure our data maintains its expected format across the board.