Remove `netcdf_engine` from Field and FieldSet #703

Job	Run time
mypy	3m 23s
py3.13 \| macos \| integration tests	14m 27s
py3.13 \| macos \| unit tests	8m 44s
py3.13 \| ubuntu \| integration tests	15m 51s
py3.13 \| ubuntu \| unit tests	10m 39s
py3.13 \| windows \| integration tests	23m 40s
py3.13 \| windows \| unit tests	13m 47s
py3.10 \| ubuntu \| integration tests	15m 37s
py3.10 \| ubuntu \| unit tests	10m 59s
py3.11 \| ubuntu \| unit tests	10m 54s
py3.12 \| ubuntu \| unit tests	10m 41s
merge-test-artifacts	1s
	2h 18m 43s

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