[backport 2.3.x] ENH: Enable .mode to sort with NA values (#60702) #21512

Job	Run time
Linux-32-bit	20m 29s
Linux-Musl	22m 26s
python-dev (macOS-13)	31m 44s
python-dev (macOS-14)	15m 43s
python-dev (ubuntu-22.04)	24m 4s
python-dev (windows-latest)	26m 0s
macos-13 actions-310.yaml	43m 25s
macos-13 actions-311.yaml	38m 52s
macos-13 actions-312.yaml	49m 49s
macos-13 actions-39.yaml	46m 58s
macos-14 actions-310.yaml	25m 31s
macos-14 actions-311.yaml	24m 32s
macos-14 actions-312.yaml	26m 15s
macos-14 actions-39.yaml	35m 34s
windows-latest actions-311.yaml	42m 53s
windows-latest actions-312.yaml	47m 53s
windows-latest actions-310.yaml	42m 5s
windows-latest actions-39.yaml	41m 18s
ubuntu-latest actions-310.yaml	54m 18s
Copy-on-Write 3.10 (warnings)	32m 6s
Copy-on-Write 3.10	29m 15s
ubuntu-latest actions-311.yaml	51m 39s
Future infer strings (without pyarrow)	46m 56s
Locale: zh_CN	28m 9s
Copy-on-Write 3.11	28m 2s
Copy-on-Write 3.11 (warnings)	27m 30s
Locale: it_IT	27m 29s
Downstream Compat	5m 40s
Numpy Dev	22m 48s
Pyarrow Nightly	24m 6s
Future infer strings	39m 34s
Copy-on-Write 3.12	30m 47s
ubuntu-latest actions-312.yaml	38m 11s
ubuntu-latest actions-39.yaml	53m 31s
Copy-on-Write 3.9 (warnings)	27m 55s
Copy-on-Write 3.9	29m 17s
Minimum Versions	29m 49s
Pypy	7m 37s
	20h 40m 10s

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