Skip rf_memleak tests (#5529)

reference for tracking:  #5528

Authors:
  - Dante Gama Dessavre (https://github.com/dantegd)

Approvers:
  - William Hicks (https://github.com/wphicks)
  - Simon Adorf (https://github.com/csadorf)

URL: #5529

python/cuml/tests/test_random_forest.py

@@ -1156,6 +1156,10 @@ def predict_with_json_rf_regressor(rf, x):
         np.testing.assert_almost_equal(pred, expected_pred, decimal=6)
 
 
+@pytest.mark.xfail(
+    reason="Needs refactoring/debugging due to sporadic failures"
+    "https://github.com/rapidsai/cuml/issues/5528"
+)
 @pytest.mark.memleak
 @pytest.mark.parametrize("estimator_type", ["classification"])
 def test_rf_host_memory_leak(large_clf, estimator_type):
@@ -1196,6 +1200,10 @@ def test_rf_host_memory_leak(large_clf, estimator_type):
     assert (final_mem - initial_baseline_mem) < 2.4e6
 
 
+@pytest.mark.xfail(
+    reason="Needs refactoring/debugging due to sporadic failures"
+    "https://github.com/rapidsai/cuml/issues/5528"
+)
 @pytest.mark.memleak
 @pytest.mark.parametrize("estimator_type", ["regression", "classification"])
 @pytest.mark.parametrize("i", list(range(100)))