executor: add back metrics for select_result.go:fetchResp() (#13975)
executor: add back metrics for select_result.go:fetchResp() (#13975)


ngaut/tidb,EvilMcJerkface/tidb,ming-relax/tidb,EvilMcJerkface/tidb,coocood/tidb,kyle-wang/tidb,pingcap/tidb,pingcap/tidb,Cofyc/tidb,ngaut/tidb,ngaut/tidb,c4pt0r/tidb,c4pt0r/tidb,c4pt0r/tidb,ngaut/tidb,c4pt0r/tidb,pingcap/tidb,pingcap/tidb,pingcap/tidb,pingcap/tidb,kyle-wang/tidb,kyle-wang/tidb,kyle-wang/tidb,coocood/tidb,c4pt0r/tidb,XuHuaiyu/tidb,ming-relax/tidb,Cofyc/tidb,kyle-wang/tidb,kyle-wang/tidb,c4pt0r/tidb,ngaut/tidb,ngaut/tidb,XuHuaiyu/tidb