Disallow MERGE cleanly for foreign partitions

While directly targetting a foreign table with MERGE was already
expressly forbidden, we failed to catch the case of a partitioned table
that has a foreign table as a partition; and the result if you try is an
incomprehensible error.  Fix that by adding a specific check.

Backpatch to 15.

Reported-by: Tatsuhiro Nakamori <[email protected]>
Discussion: https://postgr.es/m/[email protected]

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/cba4e78f3599f7edc3fb53d1b094f037fbb8158a

Modified Files
--------------
contrib/postgres_fdw/expected/postgres_fdw.out |  5 +++++
contrib/postgres_fdw/sql/postgres_fdw.sql      |  4 ++++
src/backend/optimizer/plan/createplan.c        | 20 ++++++++++++++++++++
3 files changed, 29 insertions(+)

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