Enable GatewayAddressEmpty conformance test (#3602)

NGF supports an empty Gateway Address, but the conformance test was not enabled.

Author: sjberman

tests/Makefile

@@ -12,7 +12,7 @@ GW_SERVICE_TYPE = NodePort## Service type to use for the gateway
 NGF_VERSION ?= edge## NGF version to be tested
 PULL_POLICY = Never## Pull policy for the images
 NGINX_CONF_DIR = internal/controller/nginx/conf
-SUPPORTED_EXTENDED_FEATURES = HTTPRouteQueryParamMatching,HTTPRouteMethodMatching,HTTPRoutePortRedirect,HTTPRouteSchemeRedirect,HTTPRouteHostRewrite,HTTPRoutePathRewrite,GatewayPort8080,HTTPRouteResponseHeaderModification,HTTPRoutePathRedirect,GatewayHTTPListenerIsolation,GatewayInfrastructurePropagation,HTTPRouteRequestMirror,HTTPRouteRequestMultipleMirrors,HTTPRouteBackendProtocolWebSocket
+SUPPORTED_EXTENDED_FEATURES = HTTPRouteQueryParamMatching,HTTPRouteMethodMatching,HTTPRoutePortRedirect,HTTPRouteSchemeRedirect,HTTPRouteHostRewrite,HTTPRoutePathRewrite,GatewayPort8080,GatewayAddressEmpty,HTTPRouteResponseHeaderModification,HTTPRoutePathRedirect,GatewayHTTPListenerIsolation,GatewayInfrastructurePropagation,HTTPRouteRequestMirror,HTTPRouteRequestMultipleMirrors,HTTPRouteBackendProtocolWebSocket
 STANDARD_CONFORMANCE_PROFILES = GATEWAY-HTTP,GATEWAY-GRPC
 EXPERIMENTAL_CONFORMANCE_PROFILES = GATEWAY-TLS
 CONFORMANCE_PROFILES = $(STANDARD_CONFORMANCE_PROFILES) # by default we use the standard conformance profiles. If experimental is enabled we override this and add the experimental profiles.