Remove usage of DisplayName API from S3 integ test as S3 no longer sends it (#6305)

* Handle eventual consistency test case to make sure to wait for some time so that item is eventually available

* Remove use of s3 owner.displayName() api usage as it was causing Integ test failures

Author: joviegas

services/s3/src/it/java/software/amazon/awssdk/services/s3/S3ListObjectsV2IntegrationTest.java

@@ -332,7 +332,6 @@ private void assertS3ObjectSummariesAreValid(List<S3Object> objectSummaries,
 
             if (shouldIncludeOwner) {
                 assertNotNull(obj.owner());
-                assertTrue(obj.owner().displayName().length() > 1);
                 assertTrue(obj.owner().id().length() > 1);
             }
         }