Ensure cross account access is disabled for Azure SQL Server

Start and End IPs are too open, they may lead to cross account access for Azure SQL Server.

In Azure Console -

1. Open the Azure Portal and go to SQL servers.
2. Choose the SQL server you wish to edit.
3. Under Networking, Validate start ip address and end ip address are not set to public internet.
4. Select Save

In Terraform -

1. In the azurerm_sql_firewall_rule resource, set start_ip_address and end_ip_address.

References:
https://learn.microsoft.com/en-us/azure/azure-sql/database/firewall-configure?view=azuresql
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/sql_firewall_rule