Reduce single node test cleanup logging (#39060)

As per #39049 (comment)

Author: David Roberts

test/framework/src/main/java/org/elasticsearch/test/ESSingleNodeTestCase.java

@@ -120,7 +120,7 @@ public void setUp() throws Exception {
 
     @Override
     public void tearDown() throws Exception {
-        logger.info("[{}#{}]: cleaning up after test", getTestClass().getSimpleName(), getTestName());
+        logger.trace("[{}#{}]: cleaning up after test", getTestClass().getSimpleName(), getTestName());
         super.tearDown();
         assertAcked(client().admin().indices().prepareDelete("*").get());
         MetaData metaData = client().admin().cluster().prepareState().get().getState().getMetaData();