The memory consumed by `UpdateExec.updatedRowKeys` and `UpdateExec.mergedRowData` is not tracked

[ekexium]

Enhancement

updatedRowKeys and mergedRowData in UpdateExec can use a large amount of memory but is not tracked in the memory tracker.

update `T_CUSTOMER` set purse_num = purse_num + 1 where vip_level = '0'

update T_CUSTOMER n, T_CUSTOMER m set n.purse_num=1, m.purse_num=2 where n.vip_level = '0'

[XuHuaiyu]

refer #33877