store/copr: set low concurrency for keep order coprocessor requests (#35975)
store/copr: set low concurrency for keep order coprocessor requests (#35975)

close pingcap/tidb#35974
pingcap/tidb,pingcap/tidb,ngaut/tidb,ngaut/tidb,pingcap/tidb,ngaut/tidb,pingcap/tidb,ngaut/tidb,ngaut/tidb,pingcap/tidb,ngaut/tidb,pingcap/tidb