HPCC-8581 Display long strings at the last column(s) of Results table

Inside the existing ECL WU Results table, some rows use the column 5
to show long strings. Other rows use the column 6. It is suggested that
long strings inside the column 5 should be moved to the column 6. This
fix also moves possible extra subtable to the last column.

Signed-off-by: Kevin Wang <kevin.wang@lexisnexis.com>