feat: if preprint, fetch published doi when updating metadata

[danieljhegeman]

Reason for Change

• #575

Changes

• add logic to check if doi is a preprint, and if so, check for published doi; assign published doi if exists
• update unit test file for crossref provider to import the correct CrossrefProvider
• remove unused crossref provider module and remove unused preprint doi function for existing one

Testing steps

• add unit test for published doi

Checklist 🛎️

• Add product, design, and eng as reviewers for rdev review
• For UI changes, add screenshots/videos, so the reviewers know what you expect them to see
• For UI changes, add e2e tests to prevent regressions

Notes for Reviewer

[github-actions]

Deployment Summary

• backend_url: https://pr-6306-backend.rdev.single-cell.czi.technology
• frontend_url: https://pr-6306-frontend.rdev.single-cell.czi.technology
• delete_db_task_definition_arn: arn:aws:ecs:us-west-2:***:task-definition/dp-rdev-pr-6306-deletion:1
• migrate_db_task_definition_arn: arn:aws:ecs:us-west-2:***:task-definition/dp-rdev-pr-6306-migration:1

[danieljhegeman]

Closing in favor of #6311