Deprecate constructor and create a new one with injected WebEndpointProperties

- the classes extending this class, `GatewayControllerEndpoint` and `GatewayLegacyControllerEndpoint`, use the new constructor that handles the base path being overridden
- any other classes using the deprecated constructor would use the fixed base path `/actuator`

Author: Fredrich Ombico

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/actuate/AbstractGatewayControllerEndpoint.java

@@ -91,6 +91,15 @@ public class AbstractGatewayControllerEndpoint implements ApplicationEventPublis
 
 	private final SimpleMetadataReaderFactory simpleMetadataReaderFactory = new SimpleMetadataReaderFactory();
 
+	@Deprecated
+	public AbstractGatewayControllerEndpoint(RouteDefinitionLocator routeDefinitionLocator,
+			List<GlobalFilter> globalFilters, List<GatewayFilterFactory> gatewayFilters,
+			List<RoutePredicateFactory> routePredicates, RouteDefinitionWriter routeDefinitionWriter,
+			RouteLocator routeLocator) {
+		this(routeDefinitionLocator, globalFilters, gatewayFilters, routePredicates,
+				routeDefinitionWriter, routeLocator, new WebEndpointProperties());
+	}
+
 	public AbstractGatewayControllerEndpoint(RouteDefinitionLocator routeDefinitionLocator,
 			List<GlobalFilter> globalFilters, List<GatewayFilterFactory> gatewayFilters,
 			List<RoutePredicateFactory> routePredicates, RouteDefinitionWriter routeDefinitionWriter,