Dt990315/add healthcheck protocol

This merge request introduces the lb_target_group_health_check_protocol variable in variables.tf and its usage in main.tf. The goal is to allow explicit configuration of the health check protocol used by the load balancer. By default, health checks are performed using HTTPS, which can lead to failed health checks when the container is exposed on port 80 (HTTP only), resulting in ECS task failures. With this change, users can set the appropriate protocol (HTTP or HTTPS) to ensure correct health check behavior for their specific use case.