Changes

feat(tiflash): compile bench_dbms in PR pipelines (#3404)

Previously bench_dbms is not compiled at all, and it has been broken for
a while.

Now we fixed it in https://github.com/pingcap/tiflash/pull/9948 and
would like to check it in CI as well.

See replay:
https://do.pingcap.net/jenkins/blue/organizations/jenkins/pingcap%2Ftiflash%2Fpull_unit_test/detail/pull_unit_test/3428/pipeline/177/

Signed-off-by: Wish <breezewish@outlook.com>
 (commit: c61b6ce)