Backport PR #60703 on branch 2.3.x (TST(string dtype): Resolve xfails in stack_unstack) #21352

Job	Run time
Linux-32-bit	19m 42s
Linux-Musl	22m 4s
python-dev (macOS-13)	23m 27s
python-dev (macOS-14)	12m 13s
python-dev (ubuntu-22.04)	23m 37s
python-dev (windows-latest)	26m 9s
macos-13 actions-311.yaml	40m 0s
macos-13 actions-312.yaml	53m 45s
macos-13 actions-310.yaml	50m 4s
macos-13 actions-39.yaml	42m 1s
macos-14 actions-310.yaml	28m 7s
macos-14 actions-311.yaml	25m 54s
macos-14 actions-312.yaml	25m 45s
macos-14 actions-39.yaml	31m 26s
windows-latest actions-311.yaml	44m 45s
windows-latest actions-312.yaml	49m 52s
windows-latest actions-310.yaml	44m 51s
windows-latest actions-39.yaml	40m 28s
ubuntu-latest actions-310.yaml	59m 50s
Copy-on-Write 3.10 (warnings)	36m 42s
Copy-on-Write 3.10	33m 22s
ubuntu-latest actions-311.yaml	55m 47s
Locale: zh_CN	31m 59s
Copy-on-Write 3.11	32m 27s
Copy-on-Write 3.11 (warnings)	32m 54s
Locale: it_IT	32m 13s
Downstream Compat	8m 56s
Future infer strings (without pyarrow)	51m 37s
Numpy Dev	22m 32s
Pyarrow Nightly	24m 40s
ubuntu-latest actions-312.yaml	42m 10s
Future infer strings	44m 13s
Copy-on-Write 3.12	34m 36s
ubuntu-latest actions-39.yaml	51m 19s
Copy-on-Write 3.9 (warnings)	28m 0s
Copy-on-Write 3.9	28m 44s
Minimum Versions	28m 14s
Pypy	8m 9s
	21h 32m 34s

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