chore: Add forwarder replicate instance 4debug

[pasqualespica]

List of changes

./terraform.sh apply <ENV>  -target="azurerm_resource_group.node_forwarder_dbg_rg" -target="module.node_forwarder_dbg_snet" -target="module.node_forwarder_dbg_ha_snet" -target="azurerm_subnet_nat_gateway_association.nodefw_dbg_ha_snet_nat_association" -target="module.node_forwarder_dbg_app_service" -target="module.node_forwarder_dbg_slot_staging" -target="azurerm_monitor_autoscale_setting.node_forwarder_dbg_app_service_autoscale"

Motivation and context

Type of changes

• Add new resources
• Update configuration to existing resources
• Remove existing resources

Does this introduce a change to production resources with possible user impact?

• Yes, users may be impacted applying this change
• No

Does this introduce an unwanted change on infrastructure? Check terraform plan execution result

• Yes
• No

Other information

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If PR is partially applied, why? (reserved to mantainers)