tools/check: 'ut' now remove support for the old test cases (#34800)
tools/check: 'ut' now remove support for the old test cases (#34800)

close pingcap/tidb#30822
c4pt0r/tidb,kyle-wang/tidb,c4pt0r/tidb,kyle-wang/tidb,pingcap/tidb,ngaut/tidb,pingcap/tidb,kyle-wang/tidb,kyle-wang/tidb,c4pt0r/tidb,ngaut/tidb,c4pt0r/tidb,ngaut/tidb,kyle-wang/tidb,pingcap/tidb,pingcap/tidb,ngaut/tidb,pingcap/tidb,kyle-wang/tidb,pingcap/tidb,c4pt0r/tidb,ngaut/tidb,ngaut/tidb,c4pt0r/tidb