ddl: support truncate partition for label rules  (#26841)
ddl: support truncate partition for label rules  (#26841)

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