nit: make test more robust by adding retryable timeout

Signed-off-by: yuxiqian <34335406+yuxiqian@users.noreply.github.com>

Author: yuxiqian

flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-doris/src/test/java/org/apache/flink/cdc/connectors/doris/sink/DorisMetadataApplierITCase.java

@@ -472,9 +472,11 @@ public void testDorisTruncateTable() throws Exception {
                         DataChangeEvent.insertEvent(tableId, generate(schema, 3, 4.5, "Cecily")),
                         DataChangeEvent.insertEvent(tableId, generate(schema, 4, 5.6, "Derrida")));
         runJobWithEvents(truncateTestingEvents);
-        assertEqualsInAnyOrder(
+        waitAndVerify(
+                tableId,
+                3,
                 Arrays.asList("3 | 4.5 | Cecily", "4 | 5.6 | Derrida"),
-                fetchTableContent(tableId, 3));
+                DATABASE_OPERATION_TIMEOUT_SECONDS * 1000L);
     }
 
     @Test