[e2e] Fix kafka-connect healthcheck (#1921)

documentation/compose/kafka-ui-connectors-auth.yaml

@@ -100,6 +100,7 @@ services:
       CONNECT_INTERNAL_KEY_CONVERTER: org.apache.kafka.connect.json.JsonConverter
       CONNECT_INTERNAL_VALUE_CONVERTER: org.apache.kafka.connect.json.JsonConverter
       CONNECT_REST_ADVERTISED_HOST_NAME: kafka-connect0
+      CONNECT_REST_PORT: 8083
       CONNECT_PLUGIN_PATH: "/usr/share/java,/usr/share/confluent-hub-components"
       CONNECT_REST_EXTENSION_CLASSES: "org.apache.kafka.connect.rest.basic.auth.extension.BasicAuthSecurityRestExtension"
       KAFKA_OPTS: "-Djava.security.auth.login.config=/conf/kafka_connect.jaas"