Federated Connection errors are swallowed

[mhart]

Federated Connection errors are currently not being surfaced, which makes debugging problems nigh on impossible:

https://github.com/auth0-lab/auth0-ai-js/blob/561680e1be7298686ac7fba11757bb16d77f86e7/packages/ai/src/authorizers/federated-connections/index.ts#L134-L136

Not sure if the best strategy is to throw here – or log in some way and return something else?