Ensure shared access policies are not used for IoT Hub Device Provisioning Service (DPS)

Azure IoT Hub Device Provisioning Service (DPS) shared access policies expose the IoT Hub to potential security vulnerabilities inherent in security tokens.

In Azure Console -

1. Open the Azure Portal and go to IoT Hub.
2. Choose the IoT Hub DPS you wish to edit.
3. Under Security settings, select Shared Access Policies.
4. Delete any user-created shared access policies found.
   Note: for identity and access management, see the Azure documentation.

In Terraform -

1. For each azurerm_iothub_dps resource, remove any azurerm_iothub_dps_shared_access_policy resources.

References:
https://learn.microsoft.com/en-us/azure/iot-dps/concepts-roles-operations
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/iothub_dps_shared_access_policy