Function finalize_output 

pub fn finalize_output<'a>(
    working_file: &'a str,
    effective_output: &'a str,
) -> Result<&'a str>

Finalize a handler’s output: re-zip the working .zarr directory when the target is .zarr.zip, and return the path the user will actually find (the archive for a .zarr.zip target, otherwise the working file).