ENH: Enable .mode to sort with NA values #21348

Job	Run time
Linux-32-bit	10s
Linux-Musl	10s
Pyodide build	11s
python-freethreading	12s
macos-13 actions-310.yaml	9s
macos-13 actions-311.yaml	11s
macos-13 actions-312.yaml	9s
macos-14 actions-310.yaml	11s
macos-14 actions-311.yaml	9s
macos-14 actions-312.yaml	11s
windows-latest actions-311.yaml	8s
windows-latest actions-310.yaml	8s
python-dev (macOS-13)	48s
python-dev (macOS-14)	11s
python-dev (ubuntu-22.04)	9s
python-dev (windows-latest)	6s
windows-latest actions-312.yaml	7s
ubuntu-latest actions-310.yaml	10s
Minimum Versions	10s
ubuntu-latest actions-311.yaml	11s
Future infer strings (without pyarrow)	10s
Locale: zh_CN	10s
Locale: it_IT	11s
Downstream Compat	10s
Numpy Dev	10s
Pyarrow Nightly	11s
Future infer strings	10s
Pypy	9s
ubuntu-latest actions-312.yaml	10s
	5m 22s

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