API key to dev environment in tests

[neubig]

As I was looking through, I noticed that we’re sharing the staging API key for [email protected] in the tests: https://github.com/neulab/explainaboard_cli/blob/main/explainaboard_cli/tests/test_utils.py#L11

Do you think we should do that? I feel like maybe we shouldn’t, as it would allow an arbitrary person to upload systems without having any way to trace where they came from.