esp_http_client example: Add cert for redirect to HTTPS example

esp_http_client_test.py: Add checks for missing example logs

examples/protocols/esp_http_client/main/esp_http_client_example.c

@@ -481,6 +481,7 @@ static void http_redirect_to_https(void)
     esp_http_client_config_t config = {
         .url = "http://httpbin.org/redirect-to?url=https%3A%2F%2Fwww.howsmyssl.com",
         .event_handler = _http_event_handler,
+        .cert_pem = howsmyssl_com_root_cert_pem_start,
     };
     esp_http_client_handle_t client = esp_http_client_init(&config);
     esp_err_t err = esp_http_client_perform(client);