Tests

Refactor mock_store to use zarr open_group instead of FsspecStore #2169

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Job	Run time
pre-commit 3.12 / ubuntu-latest	41s
safety 3.12 / ubuntu-latest	25s
tests 3.12 / ubuntu-latest	1m 58s
tests 3.11 / ubuntu-latest	1m 51s
tests 3.12 / windows-latest	3m 42s
tests 3.12 / macos-latest	2m 10s
docs-build 3.12 / ubuntu-latest	52s
coverage	0s
	11m 39s