Handle ordered parameter in CategoricalIndex.__repr__ (#16683)

Thanks @mroeschke for catching this in #16665 (comment)

This PR factors in the `ordered` parameter while generating the `repr` for `CategoricalIndex`.

Authors:
  - GALI PREM SAGAR (https://github.com/galipremsagar)

Approvers:
  - Matthew Roeschke (https://github.com/mroeschke)

URL: #16683

python/cudf/cudf/core/index.py

@@ -1456,6 +1456,7 @@ def __repr__(self):
                 pd_preprocess.dtype._categories = (
                     preprocess.categories.to_pandas()
                 )
+                pd_preprocess.dtype._ordered = preprocess.dtype.ordered
                 cats_repr = repr(pd_preprocess).split("\n")
                 output = "\n".join(data_repr[:-1] + cats_repr[-1:])
 

python/cudf/cudf/tests/test_repr.py

@@ -1491,3 +1491,11 @@ def test_large_unique_categories_repr():
     with utils.cudf_timeout(2, timeout_message="Failed to repr fast enough"):
         actual_repr = repr(gi)
     assert expected_repr == actual_repr
+
+
+@pytest.mark.parametrize("ordered", [True, False])
+def test_categorical_index_ordered(ordered):
+    pi = pd.CategoricalIndex(range(10), ordered=ordered)
+    gi = cudf.CategoricalIndex(range(10), ordered=ordered)
+
+    assert repr(pi) == repr(gi)