Add option to enable eager authentication

[thepatrickchin]

Description

This PR adds a use_eager_auth option in auth provider configurations to trigger authentication flow at WebSocket connection time. This is an opt-in feature that preserves the existing behavior of triggering auth flow when the workflow requires credentials when use_eager_auth is false (default).

If the user cancels or declines the initial authentication request, the authorization flow will still be triggered when the workflow requires credentials.

Closes #1836

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