TST (string dtype): resolve all xfails in JSON IO tests #20408

Job	Run time
Linux-32-bit	18m 55s
Linux-Musl	16m 55s
Pyodide build	24m 49s
python-freethreading	24m 0s
python-dev (macOS-13)	20m 46s
python-dev (macOS-14)	11m 44s
python-dev (ubuntu-22.04)	20m 31s
python-dev (windows-latest)	23m 31s
macos-13 actions-310.yaml	29m 10s
macos-13 actions-311.yaml	29m 14s
macos-13 actions-312.yaml	37m 16s
macos-14 actions-310.yaml	19m 52s
macos-14 actions-312.yaml	22m 15s
macos-14 actions-311.yaml	25m 40s
windows-latest actions-311.yaml	33m 59s
ubuntu-latest actions-310.yaml	45m 8s
windows-latest actions-310.yaml	35m 12s
windows-latest actions-312.yaml	44m 54s
Minimum Versions	23m 49s
ubuntu-latest actions-311.yaml	40m 54s
Future infer strings (without pyarrow)	38m 40s
Downstream Compat	6m 1s
Locale: zh_CN	23m 27s
Locale: it_IT	23m 49s
Numpy Dev	16m 26s
Pyarrow Nightly	19m 18s
ubuntu-latest actions-312.yaml	44m 36s
Future infer strings	48m 14s
Pypy	1m 8s
	12h 50m 13s

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