Test

Implement support for `structured` and `struct` zarr-extension defined dtypes #6829

Job	Run time
py=3.14-upstream	11m 33s
doctests	56s
Benchmark smoke test	8m 7s
py=3.12-min_deps	7m 20s
os=ubuntu-latest, py=3.13, deps=optional	7m 8s
os=macos-latest, py=3.12, deps=optional	11m 27s
os=ubuntu-latest, py=3.12, deps=optional	7m 12s
os=ubuntu-latest, py=3.12, deps=minimal	5m 11s
os=ubuntu-latest, py=3.14, deps=minimal	6m 45s
os=ubuntu-latest, py=3.14, deps=optional	8m 6s
os=windows-latest, py=3.14, deps=optional	9m 14s
os=ubuntu-latest, py=3.13, deps=minimal	5m 58s
os=macos-latest, py=3.14, deps=optional	4m 48s
os=windows-latest, py=3.12, deps=optional	11m 7s
Test complete	4s
	1h 44m 56s

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