Remove NestedField #718

Job	Run time
mypy	3m 25s
py3.13 \| macos \| integration tests	15m 24s
py3.13 \| macos \| unit tests	8m 44s
py3.13 \| ubuntu \| integration tests	15m 46s
py3.13 \| ubuntu \| unit tests	10m 8s
py3.13 \| windows \| integration tests	24m 56s
py3.13 \| windows \| unit tests	14m 10s
py3.10 \| ubuntu \| integration tests	16m 26s
py3.10 \| ubuntu \| unit tests	10m 53s
py3.11 \| ubuntu \| unit tests	10m 20s
py3.12 \| ubuntu \| unit tests	10m 32s
merge-test-artifacts	2s
	2h 20m 46s

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