Fix cox objective test by using XGBOOST_PARALLEL_STABLE_SORT #7756
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XGBOOST_PARALLEL_SORT cannot preserve the original order of equal elements. It causes flaky failure for the cox regression unittest. Use stable sort to make sure the result is deterministic. Fix dmlc#7754
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XGBOOST_PARALLEL_SORT cannot preserve the original order of
equal elements. It causes flaky failure for the cox regression
unittest. Use stable sort to make sure the result is deterministic.
Fix #7754