Ensure that logging for detailed error messages is enabled for Azure App Service

Azure App service does not have detailed error messages enabled, this may make audit challenging.

In Azure Console -

1. Open the Azure Portal and go to App Services.
2. Select the App service you wish to edit (the setting only applies to Windows app services).
3. Select App Service Logs under Monitoring.
4. Set Detailed Error Messages to On.
5. Save.

In Terraform -

1. In the azurerm_app_service resource, set detailed_error_messages_enabled to true.

References:
https://learn.microsoft.com/en-us/azure/app-service/troubleshoot-diagnostic-logs
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/app_service#detailed_error_messages_enabled