Partially accept plan changes in updatable_views

Upstream commit 215b43cdc8d6b4a1700886a39df1ee735cb0274d significantly
reworked planning of leaky functions. In practice that change means we
no longer have to push leaky functions into a subquery. Which greatly
simplifies some plans, including the two in this patch.

This commit accepts the plans only partially, though. It uses the plans
from upstream, and adds a Remote Subquery Scan node at the top, so we
accept the general plan shape change.

But there are a few additional differences that need futher evaluation,
particularly in target lists (Postgres-XL generating more entries than
upstream) and SubPlans (Postgres-XL only generating one subplan, while
upstream generates two alternative ones).

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