store/tikv: fix a concurrency bug that may cause the batchClient timeout (#22239)
store/tikv: fix a concurrency bug that may cause the batchClient timeout (#22239)

 
kyle-wang/tidb,coocood/tidb,pingcap/tidb,kyle-wang/tidb,pingcap/tidb,pingcap/tidb,pingcap/tidb,kyle-wang/tidb,pingcap/tidb,c4pt0r/tidb,kyle-wang/tidb,ngaut/tidb,ngaut/tidb,c4pt0r/tidb,pingcap/tidb,kyle-wang/tidb,ngaut/tidb,c4pt0r/tidb,coocood/tidb,ngaut/tidb,kyle-wang/tidb,c4pt0r/tidb,c4pt0r/tidb,ngaut/tidb,c4pt0r/tidb,ngaut/tidb