Ensure that the attribute 'baseline' in Defender for IoT is not set to false

Defender for IoT will fail in identifying security related system configuration issues.

In Azure Console -

1. Go to Azure IoT Hub.
2. Choose an IoT Hub to edit.
3. In the Defender for IoT, Choose Settings.
4. Click on the Recommendation Configuration and choose the Baseline recommendation.
5. Click Enable.

In Terraform -

1. In the azurerm_iot_security_solution resource, set recommendations_enabled.baseline to true.

References:
https://learn.microsoft.com/en-us/azure/defender-for-iot/device-builders/concept-baseline
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/iot_security_solution#baseline