The document upload process has been simplified by removing unnecessary error-handling code around file reading. This makes the upload code easier to maintain while keeping any real upload issues visible to users through the normal web interface.

Based on file sources, we have determined that errors will never occur during the
file reading process. If it fails, it will be naturally reported to the web client.

This PR simplifies the code and eliminates unnecessary exception handling.

Task-3973319

This update converts field service-related automated tests to a newer testing framework. It improves maintainability and reliability of internal quality checks without changing day-to-day user workflows.

_*= industry_fsm_stock, industry_fsm_sale

task-3935514