 statistics/handle: enable flaky and shard test (#35251)
 statistics/handle: enable flaky and shard test (#35251)

ref pingcap/tidb#35247
pingcap/tidb,kyle-wang/tidb,pingcap/tidb,pingcap/tidb,ngaut/tidb,kyle-wang/tidb,pingcap/tidb,ngaut/tidb,kyle-wang/tidb,ngaut/tidb,pingcap/tidb,ngaut/tidb,kyle-wang/tidb,kyle-wang/tidb,ngaut/tidb,kyle-wang/tidb,ngaut/tidb,pingcap/tidb