executor: migrate test-infra to testify for select_into_test.go (#32415)
executor: migrate test-infra to testify for select_into_test.go (#32415)

close pingcap/tidb#28607
pingcap/tidb,ngaut/tidb,kyle-wang/tidb,pingcap/tidb,c4pt0r/tidb,kyle-wang/tidb,kyle-wang/tidb,kyle-wang/tidb,kyle-wang/tidb,pingcap/tidb,kyle-wang/tidb,ngaut/tidb,c4pt0r/tidb,ngaut/tidb,c4pt0r/tidb,pingcap/tidb,c4pt0r/tidb,pingcap/tidb,ngaut/tidb,c4pt0r/tidb,ngaut/tidb,ngaut/tidb,pingcap/tidb,c4pt0r/tidb