Add macro for customizing an archiving WARNING message.

Nathan Bossart <nathan@postgresql.org>

Commit: 2c29e7fc95b24f5ccfec0d2db458d2130606f446
Author: Nathan Bossart <nathan@postgresql.org>
Date: 2024-03-04T21:41:42Z
Releases: 17.0
Add macro for customizing an archiving WARNING message.

Presently, if an archive module's check_configured_cb callback
returns false, a generic WARNING message is emitted, which
unfortunately provides no actionable details about the reason why
the module is not configured.  This commit introduces a macro that
archive module authors can use to add a DETAIL line to this WARNING
message.

Co-authored-by: Tung Nguyen
Reviewed-by: Daniel Gustafsson, Álvaro Herrera
Discussion: https://postgr.es/m/4109578306242a7cd5661171647e11b2%40oss.nttdata.com

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