Changes

feat(pingcap/tidb): support run_if_changed for br module (#2913)

Reverts PingCAP-QE/ci#2899

We have updated the Prow status reconciler and fixed the bug that
triggered all open pull requests after modifying the regex.
https://github.com/ti-community-infra/test-infra/pull/47
 (commit: 90007bd)