Fix EXPLAIN ANALYZE SELECT INTO

Fix EXPLAIN ANALYZE SELECT INTO

EXPLAIN ANALYZE SELECT INTO was missing the treatment that we give to a regular
SELECT INTO or CREATE TABLE AS SELECT. This patch fixes that such that even
when EXPLAIN ANALYZE is used, we first create the target table and then insert
the selected rows.

The EXPLAIN ANALYZE will only show the plan for the final transformed INSERT
INTO statement. This is not very useful right now the EXPLAIN ANALYZE doesn't
show anything below Remote Subquery Scan, but that's a separate issue and will
be fixed in a separate patch.

The regression test's expected output is updated accordingly.

This will be backpatched to XL9_5_STABLE.