Comment out noisy libpq_pipeline test

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: cc6e64afda530576d83e331365d36c758495a7cd
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2024-03-14T09:23:38Z
Releases: 17.0
Comment out noisy libpq_pipeline test

libpq_pipeline's new 'cancel' test needs more research; disable it
temporarily to prevent measles in the buildfarm.

Files