Update dask-cudf parquet tests to reflect upstream bugfixes to `_meta…

…data` (#10206)

As pointed out in [this issue comment](#10141 (comment)), we should be good to update some of dask-cudf's parquet testing to reflect bug fixes merged in dask/dask#6047.

cc @rjzamora in case you see some other tests that could be resolved here

Authors:
  - Charles Blackmon-Luca (https://github.com/charlesbluca)

Approvers:
  - Richard (Rick) Zamora (https://github.com/rjzamora)

URL: #10206

python/dask_cudf/dask_cudf/io/tests/test_parquet.py

@@ -40,12 +40,7 @@ def test_roundtrip_from_dask(tmpdir, stats):
     tmpdir = str(tmpdir)
     ddf.to_parquet(tmpdir, engine="pyarrow")
     files = sorted(
-        [
-            os.path.join(tmpdir, f)
-            for f in os.listdir(tmpdir)
-            # TODO: Allow "_metadata" in list after dask#6047
-            if not f.endswith("_metadata")
-        ],
+        [os.path.join(tmpdir, f) for f in os.listdir(tmpdir)],
         key=natural_sort_key,
     )