Put back intra-grant-inplace.spec test coverage

Peter Eisentraut <peter@eisentraut.org>

Commit: baf45ba0533f872acec16ece7f45f4db13fcbd3f
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2025-08-27T15:33:54Z
Releases: 18.0
Put back intra-grant-inplace.spec test coverage

Commit d31bbfb6590 lost some test coverage, because the situation
being tested, a concurrent DROP, cannot happen anymore.  Put the test
coverage back with a bit of a trick, by deleting directly from the
catalog table.

Co-authored-by: Noah Misch <noah@leadboat.com>
Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>
Discussion: https://www.postgresql.org/message-id/flat/bf72b82c-124d-4efa-a484-bb928e9494e4@eisentraut.org

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