while it's nice to use the decorator to signify fixtures with side
effects, it has unfortunate problems of completely overriding any
fixtures you've declared in the funcargs - so isn't really suitable
for our usecase where we often have other fixtures we rely on to
return values to us.
So for consistency, let's remove this and stick to using funcargs
to define our fixtures
this create_user function can be imported for use in creating specific
users in your tests, for example
```
from tests.app.db import create_user
def test_create_user_persists_to_database(notify_db_session):
user = create_user()
assert User.query.count() == 1
```
this has the benefit of not requiring you to pass the notify_db and
notify_db_session fixtures around, and separating custom object
creation from the fixture dependency trees to aid clarity
I started with sample_user since it has no downstream dependencies, but
the intention is to push this out to all db fixtures eventually. This
is a total conversion, but can be rolled out in a non-breaking manner
by keeping arguments in the fixture, and passing them through to the
new db function - then tests can be updated to use the create_* instead
of sample_* functions as and when you want to
