chunk: refactor test to fix unstable test (#36217)
chunk: refactor test to fix unstable test (#36217)

 
pingcap/tidb,ngaut/tidb,pingcap/tidb,ngaut/tidb,pingcap/tidb,ngaut/tidb,pingcap/tidb,pingcap/tidb,ngaut/tidb,ngaut/tidb,ngaut/tidb,pingcap/tidb