Multiprocess fork issue on MacOS

[harryyo]

funding-service-design-notification/tests/conftest.py

Line 14 in 045f24a

multiprocessing.set_start_method("fork") # Required on macOSX

Running pytest on MacOS can cause issues if multiprocessing method is not set to "fork".

We need to ideally find a solution that doesn't require os-specific logic in our code for tests to run