Add temporary debug info to help debug 019_replslot_limit.pl failures.

Andres Freund <andres@anarazel.de>

Commit: afdeff10526e29e3fc63b18c08100458780489d9
Author: Andres Freund <andres@anarazel.de>
Date: 2022-02-23T02:02:34Z
Releases: 15.0
Add temporary debug info to help debug 019_replslot_limit.pl failures.

I have not been able to reproduce the occasional failures of
019_replslot_limit.pl we are seeing in the buildfarm and not for lack of
trying. The additional logging and increased log level will hopefully help.

Will be reverted once the cause is identified.

Discussion: https://postgr.es/m/20220218231415.c4plkp4i3reqcwip@alap3.anarazel.de

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