SCDF loginUrl config invalid

[Micron818]

Description:
have only one client registration configured , and want to skip the login page (or the "choose client" page)
and directly redirect to the authorization server; set the loginUrl config bug invalid;

Release versions:
DATAFLOW_VERSION=2.11.5

Screenshots:

Additional context:
SCDF in k8s, and integrated with Keycloak for authentication and authorization.