Gets the OIDC discovery document for the cluster. See the [OpenID Connect Discovery 1.0
specification](https://openid.net/specs/openid-connect-discovery-1_0.html) for details. This API
is not yet intended for general use, and is not available for all clusters.
Create a request for the method "well-known.getOpenid-configuration".
This request holds the parameters needed by the container server. After setting any optional
parameters, call the
AbstractGoogleClientRequest.execute() method to invoke the remote
operation.