Upload test.jsonl.gz

Convert dataset to the format required by `AbsTaskClusteringFast`:
```
{"sentences": "Sentence1", "labels": ["label_level1", "label_level2",...]}
```

No more generating splits.

Removed duplicates based on article id.

test.jsonl.gz

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:8dff42f6c622a64dcce62f2561ae5ffdaa705366e8162683b4bef49c316a783c
-size 42991819
+oid sha256:14b0efd4e497799577615e4e3a72be6da0c1ee32fc7932483061fb964e227e69
+size 30912015