Improve test coverage for changes to inplace-updated catalogs.

Noah Misch <noah@leadboat.com>

Commit: 3c6becd3d18011c7cd018bad5294d6d60f878a5f
Author: Noah Misch <noah@leadboat.com>
Date: 2024-06-28T02:21:10Z
Releases: 15.8
Improve test coverage for changes to inplace-updated catalogs.

This covers both regular and inplace changes, since bugs arise at their
intersection.  Where marked, these witness extant bugs.  Back-patch to
v12 (all supported versions).

Reviewed (in an earlier version) by Robert Haas.

Discussion: https://postgr.es/m/20240512232923.aa.nmisch@google.com

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