fix: add new outputs to the COS DA (#783)

* fix: add resource group name output

* resolve comments

Author: iamar7

solutions/instance/outputs.tf

@@ -6,6 +6,11 @@ output "resource_group_id" {
   value       = module.resource_group.resource_group_id
 }
 
+output "resource_group_name" {
+  description = "Resource group name"
+  value       = !var.existing_resource_group ? module.resource_group.resource_group_name : var.existing_resource_group
+}
+
 output "cos_instance_id" {
   description = "COS instance id"
   value       = module.cos.cos_instance_id