Update/remove pytest-bdd v5

[conbrad]

Describe the task Upgrade pytest-bdd so we don't depend on this outdated downstream dependency. From what I remember it's hard to update pytest-bdd to v6 (I remember there being bugs in there parser) so it might be best to remove completely.

Acceptance Criteria

• [ ] Update/remove pytest-bdd
• [ ] Replace tests with built in FastAPI test client if we remove

Additional context

• poetry show --tree, grep for pytest-bdd, see py there
• Initial attempt: https://github.com/bcgov/wps/pull/2288
• They fixed a bunch of bugs since: https://github.com/pytest-dev/pytest-bdd/compare/6.0.1...6.1.1

[conbrad]

Update: pytest-bdd hasn't been patched yet, but also I've had a good experience with pytest's OOTB paramterize option which would effectively give us the same way to throw inputs and expected outputs at endpoints: https://docs.pytest.org/en/7.1.x/example/parametrize.html