Removing FieldSet.from_pop() #710

Job	Run time
mypy	3m 45s
py3.13 \| macos \| unit tests	8m 58s
py3.13 \| macos \| integration tests	12m 48s
py3.13 \| ubuntu \| unit tests	9m 48s
py3.13 \| ubuntu \| integration tests	15m 37s
py3.13 \| windows \| unit tests	11m 0s
py3.13 \| windows \| integration tests	28m 2s
py3.10 \| ubuntu \| unit tests	10m 56s
py3.10 \| ubuntu \| integration tests	15m 49s
py3.11 \| ubuntu \| unit tests	10m 43s
py3.12 \| ubuntu \| unit tests	10m 38s
merge-test-artifacts	2s
	2h 18m 6s

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