Isolate jwst/romancal pytest configuration #1973

Job	Run time
check / Load tox environments	11s
test / Load tox environments	3s
test_downstream / Load tox environments	9s
test / py310-oldestdeps-cov-xdist (ubuntu-latest)	2m 39s
test / py310-xdist (ubuntu-latest)	2m 7s
test / py311-xdist (ubuntu-latest)	2m 0s
test / py312-cov-xdist (ubuntu-latest)	3m 53s
test / py311-xdist (macos-latest)	1m 21s
test_downstream / py311-jwst-cov-xdist (ubuntu-latest)	28m 43s
test_downstream / py311-romancal-cov-xdist (ubuntu-latest)	6m 37s
check / check-style (ubuntu-latest)	43s
check / check-types (ubuntu-latest)	1m 39s
check / check-build (ubuntu-latest)	57s
	51m 2s

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