[backport 2.3.x] TST(string dtype): Resolve xfail when grouping by na… #21399

Job	Run time
Linux-32-bit	19m 57s
Linux-Musl	23m 4s
python-dev (macOS-13)	22m 40s
python-dev (macOS-14)	19m 42s
python-dev (ubuntu-22.04)	25m 4s
python-dev (windows-latest)	26m 49s
macos-13 actions-310.yaml	1h 5m 33s
macos-13 actions-311.yaml	41m 17s
macos-13 actions-312.yaml	1h 3m 0s
macos-13 actions-39.yaml	1h 5m 36s
macos-14 actions-310.yaml	33m 30s
macos-14 actions-311.yaml	36m 57s
macos-14 actions-312.yaml	23m 21s
macos-14 actions-39.yaml	37m 12s
windows-latest actions-311.yaml	45m 9s
windows-latest actions-310.yaml	43m 10s
windows-latest actions-312.yaml	49m 14s
windows-latest actions-39.yaml	38m 27s
ubuntu-latest actions-310.yaml	59m 37s
Copy-on-Write 3.10 (warnings)	33m 44s
Copy-on-Write 3.10	33m 12s
ubuntu-latest actions-311.yaml	55m 40s
Future infer strings (without pyarrow)	53m 40s
Locale: zh_CN	33m 4s
Copy-on-Write 3.11	33m 48s
Copy-on-Write 3.11 (warnings)	32m 30s
Locale: it_IT	33m 29s
Downstream Compat	6m 58s
Numpy Dev	23m 12s
Pyarrow Nightly	24m 37s
ubuntu-latest actions-312.yaml	42m 43s
Future infer strings	45m 41s
Copy-on-Write 3.9 (warnings)	28m 56s
Copy-on-Write 3.12	36m 11s
ubuntu-latest actions-39.yaml	53m 9s
Copy-on-Write 3.9	31m 3s
Minimum Versions	29m 58s
Pypy	7m 56s
	22h 58m 50s

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