ENH: Support skipna parameter in GroupBy min, max, prod, median, var, std and sem methods #21661

Job	Run time
Pyodide build	8m 22s
Linux-32-bit	8m 11s
Linux-Musl	8m 10s
python-freethreading	8m 22s
python-dev (macOS-13)	8m 26s
python-dev (macOS-14)	8m 26s
python-dev (ubuntu-22.04)	8m 24s
python-dev (windows-latest)	8m 16s
macos-13 actions-310.yaml	8m 27s
macos-13 actions-311.yaml	8m 27s
macos-13 actions-312.yaml	8m 31s
macos-14 actions-310.yaml	8m 29s
macos-14 actions-312.yaml	8m 24s
macos-14 actions-311.yaml	8m 27s
windows-latest actions-311.yaml	8m 14s
windows-latest actions-312.yaml	8m 20s
windows-latest actions-310.yaml	8m 16s
Minimum Versions	8m 21s
Future infer strings (without pyarrow)	13m 8s
Locale: zh_CN	8m 24s
Locale: it_IT	8m 25s
Downstream Compat	5m 42s
Numpy Dev	8m 25s
Pyarrow Nightly	8m 26s
Future infer strings	13m 10s
Pypy	1m 27s
ubuntu-22.04 actions-310.yaml	13m 7s
ubuntu-22.04 actions-311.yaml	13m 9s
ubuntu-22.04 actions-312.yaml	13m 8s
ubuntu-24.04-arm actions-312.yaml	13m 9s
ubuntu-24.04-arm actions-311.yaml	13m 9s
ubuntu-24.04-arm actions-310.yaml	13m 9s
	4h 56m 31s

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