Update pytest library and add pytest-asyncio and pytest-mock for better testing. Add pytest unitests for all routes in login.py. Fix a bug where an unauthorized request would error and return a 500 instead of a 401. Remove the depcrecated app.on_event functions in favor of lifespan events.

Also, remove BDT testing entries from Metdata.py before deploying
to production.

- code.json
- pyproject.toml

code.json
pyproject.toml