br: flaky integration test br_pitr

[Tristan1900]

Bug Report

Found multiples times in CI

narrow down to

# non-compliant operation
echo "non compliant operation"
restore_fail=0
run_br --pd $PD_ADDR restore point -s "local://$TEST_DIR/$PREFIX/log" --start-ts $current_ts || restore_fail=1
if [ $restore_fail -ne 1 ]; then
    echo 'pitr success' 
    exit 1
fi

where it should fail with DDL change but instead it succeeds.