Remove `netcdf_engine` from Field and FieldSet #705

Job	Run time
mypy	3m 33s
py3.13 \| macos \| unit tests	7m 47s
py3.13 \| macos \| integration tests	15m 3s
py3.13 \| ubuntu \| unit tests	10m 2s
py3.13 \| ubuntu \| integration tests	15m 43s
py3.13 \| windows \| unit tests	14m 49s
py3.13 \| windows \| integration tests	27m 59s
py3.10 \| ubuntu \| unit tests	10m 51s
py3.10 \| ubuntu \| integration tests	15m 59s
py3.11 \| ubuntu \| unit tests	10m 28s
py3.12 \| ubuntu \| unit tests	10m 38s
merge-test-artifacts	3s
	2h 22m 55s

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