Use different API key name and fix tower login --no-browser test

[jo-sm]

This PR updates the expected API key name to be TOWER_TEST_API_KEY, since TOWER_API_KEY is the actual environment variable we use in the CLI, and fixes an issue with the existing tower login --no-browser tests.

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[bradhe]

I think this is exactly what I was thinking too, nice job. Let's try it out?