enable checksum validation in IT

Signed-off-by: Himshikha Gupta <[email protected]>

server/src/internalClusterTest/java/org/opensearch/gateway/remote/RemoteRoutingTableServiceIT.java

@@ -66,6 +66,7 @@ protected Settings nodeSettings(int nodeOrdinal) {
             )
             .put("node.attr." + REMOTE_STORE_ROUTING_TABLE_REPOSITORY_NAME_ATTRIBUTE_KEY, REMOTE_ROUTING_TABLE_REPO)
             .put(REMOTE_PUBLICATION_EXPERIMENTAL, true)
+            .put(RemoteClusterStateService.REMOTE_CLUSTER_STATE_CHECKSUM_VALIDATION_ENABLED_SETTING.getKey(), true)
             .build();
     }