Restore pushdown config after CalciteNoPushdownIT class

Signed-off-by: Yuanchun Shen <yuanchu@amazon.com>

Author: yuancu

integ-test/src/test/java/org/opensearch/sql/calcite/pushdown/CalciteNoPushdownIT.java

@@ -1,13 +1,11 @@
 /*
- *
- *  * Copyright OpenSearch Contributors
- *  * SPDX-License-Identifier: Apache-2.0
- *
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
  */
 
 package org.opensearch.sql.calcite.pushdown;
 
-import org.junit.After;
+import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.runner.RunWith;
 import org.junit.runners.Suite;
@@ -115,8 +113,8 @@ public static void disablePushdown() {
     PPLIntegTestCase.GlobalPushdownConfig.enabled = false;
   }
 
-  @After
-  public void restorePushdown() {
+  @AfterClass
+  public static void restorePushdown() {
     PPLIntegTestCase.GlobalPushdownConfig.enabled = wasPushdownEnabled;
   }
 }