Tests

`CHGNetCalculator.calculate` add kwarg `task: PredTask = "efsm"` #688

Job	Run time
tests (ubuntu-latest, 3.10, highest)	4m 10s
tests (ubuntu-latest, 3.12, lowest-direct)	5m 35s
tests (macos-14, 3.10, highest)	4m 13s
tests (macos-14, 3.12, lowest-direct)	5m 41s
tests (windows-latest, 3.10, highest)	7m 27s
tests (windows-latest, 3.12, lowest-direct)	7m 7s
	34m 13s

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