Skip prepared_xacts test if max_prepared_transactions < 2

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 201436c19f405b2ef4cd00499cc93928c2fc1953
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2026-03-04T09:20:06Z
Releases: 18.4
Skip prepared_xacts test if max_prepared_transactions < 2

This reduces maintenance overhead, as we no longer need to update the
dummy expected output file every time the .sql file changes.

Discussion: https://www.postgresql.org/message-id/1009073.1772551323@sss.pgh.pa.us
Backpatch-through: 14

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