Improved ECPG warning as suggested by Michael Paquier and removed test case

Michael Meskes <meskes@postgresql.org>

Commit: f576de1db1eeca63180b1ffa4b42b1e360f88577
Author: Michael Meskes <meskes@postgresql.org>
Date: 2021-08-17T13:01:09Z
Releases: 15.0
Improved ECPG warning as suggested by Michael Paquier and removed test case
that triggers the warning during regression tests.

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