ddl: Add a failpoint for TiFlash integration tests of column-type-change (#20122)
ddl: Add a failpoint for TiFlash integration tests of column-type-change (#20122)


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