branch-3.1: [fix](test) Modify regression test to make stable and change expectedlog level #55169#55898

morrySnow merged 3 commits intoapache:branch-3.1apache/doris:branch-3.1from

seawinde:fix_mv_test_unstable_and_log_warn_31seawinde/doris:fix_mv_test_unstable_and_log_warn_31Copy head branch name to clipboard