fix: fix prometheus reporter test1

Author: fishtailfu

polaris-plugins/polaris-plugins-observability/stat-prometheus/src/test/java/com/tencent/polaris/plugins/stat/prometheus/plugin/PrometheusReporterTest.java

@@ -105,7 +105,7 @@ public void testExpiredDataClean() throws InterruptedException {
         ServiceCallResult callResult = mockServiceCallResult();
         statInfo.setRouterGauge(callResult);
         batchDone(() -> handler.reportStat(statInfo), count);
-
+        // for github action
         // mock push
         LOG.info("first mock push finish...");
         Thread.sleep(pushInterval + 50);