Enable a subset of `tests-spawn-multiprocessing-start-method`
It turns out that tests-spawn-multiprocessing-start-method
was never testing anything spawn-related (!!), as the BST_FORCE_START_METHOD
env variable was not propagated to pytest
.
Enable a subset of the tests that pass, so that things don't get worse.
Fixes and further enablements will follow.
Edited by Angelos Evripiotis