Suffix S3 path with separator for recursive delete

Without trailing path separator the recursive delete operation fails for
directory buckets (e.g. S3 Express)

plugin/trino-exchange-filesystem/src/main/java/io/trino/plugin/exchange/filesystem/s3/S3FileSystemExchangeStorage.java

@@ -360,7 +360,7 @@ private ListObjectsV2Publisher listObjectsRecursively(URI dir)
 
         ListObjectsV2Request request = ListObjectsV2Request.builder()
                 .bucket(getBucketName(dir))
-                .prefix(keyFromUri(dir))
+                .prefix(keyFromUri(dir) + PATH_SEPARATOR)
                 .build();
 
         return s3AsyncClient.listObjectsV2Paginator(request);