Remove `netcdf_engine` from Field and FieldSet #700

Job	Run time
py3.13 \| macos \| unit tests	7m 24s
mypy	3m 17s
py3.13 \| macos \| integration tests	14m 58s
py3.13 \| ubuntu \| unit tests	9m 51s
py3.13 \| ubuntu \| integration tests	15m 51s
py3.13 \| windows \| unit tests	13m 57s
py3.13 \| windows \| integration tests	27m 11s
py3.10 \| ubuntu \| unit tests	11m 5s
py3.10 \| ubuntu \| integration tests	15m 48s
py3.11 \| ubuntu \| unit tests	10m 25s
py3.12 \| ubuntu \| unit tests	10m 31s
merge-test-artifacts	0s
	2h 20m 18s

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