ci(tests): pass -s to pytest so prompts etc would be displayed

[yarikoptic]

Potentially could assist in troubleshooting
dandi/dandi-cli#1762

attn @candleindark

[yarikoptic]

so - shows

tests/test_metadata.py::test_nwb2asset_remote_asset {'size': 21}
{'status': 'skipped', 'message': 'should be edited online'}
{'size': 19936}
{'status': 'pre-validating'}
{'errors': 0}
{'status': 'validated'}
{'status': 'digesting'}
{'status': 'extracting metadata'}
{'status': 'uploading'}
{'status': 'calculating etag'}
{'status': 'initiating upload'}
{'status': 'producing asset'}
{'status': 'done'}
{'status': 'done'}

so aligns with my observation in dandi/dandi-cli#1762 (comment) .