fix IT by enable it only when pushdown enabled

Signed-off-by: xinyual <xinyual@amazon.com>

Author: xinyual

integ-test/src/test/java/org/opensearch/sql/calcite/remote/CalciteExplainIT.java

@@ -85,6 +85,7 @@ public void supportSearchSargPushDown_timeRange() throws IOException {
 
   @Test
   public void supportSearchMatchPushDown() throws IOException {
+    enabledOnlyWhenPushdownIsEnabled();
     String query =
         "source=opensearch-sql_test_index_bank birthdate = '2016-12-08 00:00:00.000000000'";
     var result = explainQueryToString(query);