[IMPROVEMENT] Error message from bricks auth login is poor/--account-id is a mandatory parameter when logging into account-level

When logging in at the account level, there is a poor user experience if account ID is not specified.

```
$ bricks auth login --verbose --host https://accounts.cloud.databricks.com
Error: oidc: parse .well-known: invalid character '<' looking for beginning of value
```