Add `tmp_zarr` fixture #346

Job	Run time
mypy	3m 48s
py3.12 \| macos \| integration tests	15m 5s
py3.12 \| macos \| unit tests	10m 38s
py3.12 \| ubuntu \| integration tests	19m 33s
py3.12 \| ubuntu \| unit tests	13m 31s
py3.12 \| windows \| integration tests	31m 57s
py3.12 \| windows \| unit tests	22m 47s
py3.10 \| ubuntu \| integration tests	19m 32s
py3.10 \| ubuntu \| unit tests	12m 59s
py3.11 \| ubuntu \| unit tests	12m 41s
merge-test-artifacts	5s
	2h 42m 36s

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