Ensure public network access disabled for Azure CosmosDB Account

Allowing unrestricted, public access to cloud services could open an application up to external attack. Disallowing this access is typically considered best practice.

In Azure Console -

1. Open the Azure Portal and go to Cosmos DB.
2. Select the Cosmos DB account you wish to edit.
3. Under Settings, choose Networking.
4. On the Public access tab, set Public network access to disabled.

In Terraform -

1. In the azurerm_cosmosdb_account resource, set public_network_access_enabled to false.

References:
https://learn.microsoft.com/en-us/azure/cosmos-db/
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/cosmosdb_account#public_network_access_enabled