Bump timeout to give slow clusters more time

Author: smalyshev

x-pack/plugin/esql/src/internalClusterTest/java/org/elasticsearch/xpack/esql/action/EsqlAsyncTestUtils.java

@@ -98,7 +98,7 @@ public static void waitForCluster(Client client, String clusterName, String asyn
  }
  assertThat(clusterInfo.getStatus(), not(equalTo(EsqlExecutionInfo.Cluster.Status.RUNNING)));
  }
- });
+ }, 20, TimeUnit.SECONDS);
  }
 
  public static EsqlQueryResponse runAsyncQuery(Client client, EsqlQueryRequest request) {