TOOLKIT: Explicitly set cache_discovery to false to silence oauth2client error.
TOOLKIT: Explicitly set cache_discovery to false to silence oauth2client error.

PiperOrigin-RevId: 323854008

GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare