Removing FieldSet.from_pop() #709

Job	Run time
mypy	3m 36s
py3.13 \| macos \| integration tests	13m 16s
py3.13 \| macos \| unit tests	8m 45s
py3.13 \| ubuntu \| integration tests	15m 29s
py3.13 \| ubuntu \| unit tests	10m 55s
py3.13 \| windows \| integration tests	24m 18s
py3.13 \| windows \| unit tests	12m 52s
py3.10 \| ubuntu \| integration tests	15m 54s
py3.10 \| ubuntu \| unit tests	10m 45s
py3.11 \| ubuntu \| unit tests	10m 19s
py3.12 \| ubuntu \| unit tests	10m 37s
merge-test-artifacts	3s
	2h 16m 49s

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