Unlinks the given third-party user from your smart home Action. All data related to this user
will be deleted. For more details on how users link their accounts, see [fulfillment and
authentication](https://developers.home.google.com/cloud-to-cloud/primer/fulfillment). The third-
party user's identity is passed in via the `agent_user_id` (see DeleteAgentUserRequest). This
request must be authorized using service account credentials from your Actions console project.
Create a request for the method "agentUsers.delete".
This request holds the parameters needed by the homegraph server. After setting any optional
parameters, call the AbstractGoogleClientRequest.execute() method to invoke the remote operation.