Reorganize forcefield tests #6184

Job	Run time
test-forcefields (3.12, torch-limited)	12m 4s
lint	1m 59s
test-notebooks-and-ase (3.12)	3m 31s
test-non-ase (3.12, 3)	4m 29s
test-torchsim	2m 35s
test-openff (3.12)	2m 42s
docs	13m 9s
test-non-ase (3.11, 2)	4m 32s
test-openff (3.11)	4m 22s
test-notebooks-and-ase (3.11)	3m 27s
test-non-ase (3.11, 3)	4m 8s
test-forcefields (3.12, e3nn-limited)	5m 9s
test-non-ase (3.12, 2)	4m 55s
test-forcefields (3.12, generic)	3m 16s
test-non-ase (3.11, 1)	9m 28s
test-non-ase (3.12, 1)	9m 46s
automerge	5s
	1h 29m 37s

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