BUG: Preserve timezone in numpy_dtype for ArrowDtype #20931

Job	Run time
Linux-32-bit	5m 7s
Linux-Musl	5m 7s
Pyodide build	5m 9s
python-dev (macOS-13)	5m 9s
python-dev (macOS-14)	5m 6s
python-dev (ubuntu-22.04)	5m 7s
python-dev (windows-latest)	5m 5s
macos-13 actions-310.yaml	5m 5s
macos-13 actions-311.yaml	5m 6s
macos-13 actions-312.yaml	5m 5s
macos-14 actions-310.yaml	5m 11s
macos-14 actions-312.yaml	5m 10s
macos-14 actions-311.yaml	5m 7s
windows-latest actions-311.yaml	5m 25s
windows-latest actions-312.yaml	5m 7s
windows-latest actions-310.yaml	5m 20s
python-freethreading	5m 10s
Minimum Versions	5m 13s
ubuntu-latest actions-310.yaml	9m 56s
ubuntu-latest actions-311.yaml	9m 53s
Locale: zh_CN	5m 4s
Locale: it_IT	5m 8s
Future infer strings (without pyarrow)	9m 55s
Downstream Compat	5m 18s
Numpy Dev	5m 22s
Pyarrow Nightly	5m 9s
Pypy	1m 8s
ubuntu-latest actions-312.yaml	9m 57s
Future infer strings	9m 56s
	2h 49m 35s

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