[ENG-8193] Fix issues with Preprint submission via API

[antkryt]

Purpose

handle django core ValidationError in drf view

Changes

QA Notes

Documentation

Side Effects

Ticket

https://openscience.atlassian.net/browse/ENG-8193

[brianjgeiger]

Could you unit test this and verify that the situation in the ticket raises a 400 error rather than having an uncaught exception? Also, is every exception at this point going to be a DjangoValidationError, or are there any other errors possible at this point, like Conflicts or JSONAPIAttributeExceptions?

[antkryt]

Any raised exceptions from rest_framework.exceptions (like Conflict, NotFound, ValidationError, etc.) are going to be handled by DRF and return appropriate status code. I've added unit tests to test 400 and 409, also added handling for ValueError. All other exceptions are not expected here I think, so they should return 500

JSONAPIAttributeExceptions and similar are going to be handled by our custom exception handler