Fix test in TestZarrIosp that was unzipping a non-zarr file and not cleaning it up after tests. This is fixed by first copying the zip file to a temporary folder before using it in the tests.
A few minor cleanups such as: remove unused imports, remove commented out code, remove unneeded null check
Description of Changes
ZArrayclassTestZarrIospthat was unzipping a non-zarr file and not cleaning it up after tests. This is fixed by first copying the zip file to a temporary folder before using it in the tests.