Error message field on error file of bulk upload

[susilnem]

Issue Description

When performing a bulk CSV upload, if an error occurs (e.g., invalid value, missing required data), the current error output does not indicate which specific field caused the problem.
This makes debugging and fixing the CSV file time-consuming, especially for large files.

Expected Behavior

The bulk upload error response should include:

• Field name that caused the error.
• Clear validation message describing the problem.