Forbid FOR PORTION OF on views with INSTEAD OF triggers

Forbid FOR PORTION OF on views with INSTEAD OF triggers

Previously, an attempt to use these features together caused a crash.
Oversight of commit 8e72d914c528.

Tests are added also to show that the check for this should be in the
rewriter, not the parser, as an earlier patch version suggested.

Author: Aleksander Alekseev <aleksander@tigerdata.com>
Author: Paul A. Jungwirth <pj@illuminatedcomputing.com>
Discussion: https://www.postgresql.org/message-id/flat/CAJ7c6TME%2Bix6VRf-2TPnVTsj8qn_hy6sYAOmMhZEivwsu2wS6g%40mail.gmail.com