Remove `netcdf_engine` from Field and FieldSet #698

Job	Run time
py3.13 \| macos \| integration tests	12m 1s
py3.13 \| macos \| unit tests	8m 43s
mypy	4m 10s
py3.13 \| ubuntu \| integration tests	13m 49s
py3.13 \| ubuntu \| unit tests	9m 57s
py3.13 \| windows \| integration tests	21m 30s
py3.13 \| windows \| unit tests	14m 42s
py3.10 \| ubuntu \| integration tests	13m 45s
py3.10 \| ubuntu \| unit tests	10m 35s
py3.11 \| ubuntu \| unit tests	10m 14s
py3.12 \| ubuntu \| unit tests	10m 21s
merge-test-artifacts	0s
	2h 9m 47s

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