Changes

chore(pingcap/tidb): update trigger for CI job `pull-br-integration-test` (#3040)

Also trigger`BR` integration testing when changes are made to `DDL`
module. @BornChanger @Benjamin2037

Fixes #3039

Signed-off-by: wuhuizuo <wuhuizuo@126.com>

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Signed-off-by: wuhuizuo <wuhuizuo@126.com>
 (commit: 6442721)