Initial unit test work

[wwsean08]

Changes

• Setup pytest and remove django-nose as nose and it have been put in maintenence mode and should not be used in new projects per https://github.com/jazzband/django-nose#note-to-users
• Create a django config for tests so that they can actually run and not complain about a missing django secret. Made it (hopefully) obviously insecure so users will never consider using it themselves.
• Removed the various user tests, they could be converted to pytest if we'd like, but doesn't seem useful given that those API endpoints aren't actually exposed.

Testing

Manually ran tests within the tau_app container running the command pytest getting the following output: