[backport 2.3.x] ENH: Enable .mode to sort with NA values (#60702) (#… #21531

Job	Run time
Linux-32-bit	20m 3s
Linux-Musl	22m 13s
python-dev (macOS-13)	37m 51s
python-dev (macOS-14)	22m 13s
python-dev (ubuntu-22.04)	24m 37s
python-dev (windows-latest)	26m 24s
ubuntu-latest actions-310.yaml	53m 54s
Copy-on-Write 3.10 (warnings)	29m 23s
Copy-on-Write 3.10	28m 48s
ubuntu-latest actions-311.yaml	52m 37s
Future infer strings (without pyarrow)	47m 6s
Locale: zh_CN	27m 40s
Copy-on-Write 3.11	26m 55s
Copy-on-Write 3.11 (warnings)	27m 11s
Locale: it_IT	28m 3s
Downstream Compat	5m 54s
Numpy Dev	22m 49s
Pyarrow Nightly	24m 12s
ubuntu-latest actions-312.yaml	39m 3s
Future infer strings	39m 2s
Copy-on-Write 3.12	31m 18s
ubuntu-latest actions-39.yaml	51m 33s
Copy-on-Write 3.9 (warnings)	29m 32s
Copy-on-Write 3.9	27m 42s
Minimum Versions	28m 14s
Pypy	7m 48s
macos-13 actions-310.yaml	43m 12s
macos-13 actions-311.yaml	30m 32s
macos-13 actions-312.yaml	55m 50s
macos-13 actions-39.yaml	40m 29s
macos-14 actions-310.yaml	30m 45s
macos-14 actions-311.yaml	39m 47s
macos-14 actions-312.yaml	30m 37s
macos-14 actions-39.yaml	46m 19s
windows-latest actions-311.yaml	41m 0s
windows-latest actions-312.yaml	45m 6s
windows-latest actions-310.yaml	39m 10s
windows-latest actions-39.yaml	35m 52s
	21h 0m 44s

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