Add enable_waf variable to network data module

Co-Authored-By: Loren Yu <loren@navapbc.com>

Author: devin-ai-integration[bot]

infra/modules/network/data/variables.tf

@@ -7,3 +7,9 @@ variable "name" {
   type        = string
   description = "The name of the VPC"
 }
+
+variable "enable_waf" {
+  type        = bool
+  description = "Whether to enable AWS Web Application Firewall (WAF) for ALBs in this network."
+  default     = true
+}