[Tracker] Track nightly and CI failures for the 26.10 development cycle #8527

This issue tracks nightly and CI failures during the 26.10 development cycle:

• [CI] Intermittent failure of cuml.accel test_voting::test_sample_weight[42] test #8384
• [CI] Network xfails cause sklearn examples to miss pass-rate threshold #8410
• [CI] Failing integration/test_rf_classifier.py::test_oob_score in wheel-tests-cuml-nightly-dependencies-versions #8425
• [CI] RandomForestRegressor sklearn compatibility check is flaky #8457
• [CI] Dask OneHotEncoder CuPy test fails during task serialization on Python 3.14 #8487
• [CI] Tracking RandomForest Failures #8507
• [CI] CD Test Failures #8508
• [CI] SG TSNE Test Failures #8509
• [CI] New test failures on GB300 #8510
• Change to scikit-learn tree node type breaks treelite.sklearn.export_model dmlc/treelite#696