`EDGEDB_SECRET_KEY` is sometimes ignored by the CLI

When trying to connect to an EdgeDB Cloud instance via CLI providing the secret key via the `EDGEDB_SECRET_KEY` env var and the instance name via CLI option, the user receives an error: `edgedb error: NoCloudConfigFound: connecting cloud instance requires a secret key`

If you instead provide both via environment variable, the CLI connects as expected.

- EdgeDB Version: 4.2
- EdgeDB CLI Version: 4.0.2+500be79
- OS Version: macOS 14.0

Steps to Reproduce:

1. Create an EdgeDB Cloud instance
2. Create (and capture) a secret key
3. Run `edgedb cloud logout`
4. Try to connect to your instance with this:
```
EDGEDB_SECRET_KEY="" edgedb -I
```