Removing FieldSet.from_pop() #720

Job	Run time
mypy	3m 23s
py3.13 \| macos \| integration tests	19m 35s
py3.13 \| macos \| unit tests	9m 36s
py3.13 \| ubuntu \| integration tests	15m 35s
py3.13 \| ubuntu \| unit tests	10m 0s
py3.13 \| windows \| integration tests	27m 22s
py3.13 \| windows \| unit tests	11m 41s
py3.10 \| ubuntu \| integration tests	16m 2s
py3.10 \| ubuntu \| unit tests	11m 1s
py3.11 \| ubuntu \| unit tests	10m 21s
py3.12 \| ubuntu \| unit tests	10m 23s
merge-test-artifacts	2s
	2h 25m 1s

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