Backpatch regression tests added by 2d689babe3cb

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: fa51cc86c684e95070228e6829e2753900c6bc79
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2022-05-20T15:52:16Z
Releases: 10.22
Backpatch regression tests added by 2d689babe3cb

A new plpgsql test function was added in 14 and up to cover for a bugfix
that was not backpatchable.  We can add it to older versions as a way to
cover other bits of DDL event triggers, with an exception clause to
avoid the problematic corner case.

Originally authored by Michaël Paquier.

Backpatch: 10 through 13.

Discussion: https://postgr.es/m/202205201523.7m5jbfvyanmj@alvherre.pgsql

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