unittest

feat: add `GroupBy.iter` #10797

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Run time

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Job	Run time
unit (3.13)	2m 41s
unit (3.12)	2m 2s
unit (3.10)	1m 52s
unit (3.11)	2m 17s
unit (3.9)	1m 56s
cover	20s
	11m 8s