Add test cover: hydra revoke token response error
Add test cover: hydra revoke token response error

Ensure we still keep the pending delete entry.

PiperOrigin-RevId: 299452159
Change-Id: Ice51ad2a1ffddbab27964df1b7841a2779dd00b8

GoogleCloudPlatform/healthcare-federated-access-services,GoogleCloudPlatform/healthcare-federated-access-services,GoogleCloudPlatform/healthcare-federated-access-services,GoogleCloudPlatform/healthcare-federated-access-services