Cookiecutter-django: Migrate to the unified Sentry Python SDK

[browniebroke]

Sentry's raven library has a deprecation notice in their documentation

Deprecated Client

This SDK has been superseded by a new unified one. The documentation here is preserved for customers using the old client. For new projects have a look at the new client documentation: Unified Python SDK.

We need to update our code anywhere the raven library is used. We need to replace this with an equivalent from the new library. Relevant sections:

• Django-specific
• logging
• Celery.

We need to check which parts are required for us and implement them in the template when Sentry is selected.

[gfabricio]

Hello, I submitted a pull request to solve this issue.