Remove NestedField #721

Job	Run time
mypy	3m 32s
py3.13 \| macos \| unit tests	8m 51s
py3.13 \| macos \| integration tests	14m 44s
py3.13 \| ubuntu \| unit tests	10m 5s
py3.13 \| ubuntu \| integration tests	15m 47s
py3.13 \| windows \| unit tests	13m 21s
py3.13 \| windows \| integration tests	25m 52s
py3.10 \| ubuntu \| unit tests	11m 2s
py3.10 \| ubuntu \| integration tests	15m 59s
py3.11 \| ubuntu \| unit tests	10m 24s
py3.12 \| ubuntu \| unit tests	10m 25s
merge-test-artifacts	3s
	2h 20m 5s

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