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

Michael Meskes <meskes@postgresql.org>

Commit: e2d6da0708df2c2e244d8748c26ebc49c0963ed5
Author: Michael Meskes <meskes@postgresql.org>
Date: 2021-08-17T13:00:42Z
Releases: 14.0
Improved ECPG warning as suggested by Michael Paquier and removed test case
that triggers the warning during regression tests.

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