Previously gporca translator was only pruning the non-visible system columns from
the table descriptor for non-partition `appendonly` tables or if the
paritition table is marked as `appendonly` at the root level.

If one of the leaf partitions in is marked as `appendonly` but the root
is not, the system columns still appears in the table descriptor.

This commit fixes the issue by checking if the root table has
`appendonly` paritions and pruning system columns if it has.