Stop using PQsendQuery in libpq_pipeline

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

Commit: 27e04412c9c3c3c3b2d182821c759f95693c0039
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2022-09-23T16:11:48Z
Releases: 15.0
Stop using PQsendQuery in libpq_pipeline

The "emulation" I wrote for PQsendQuery in pipeline mode to use extended
query protocol, in commit acb7e4eb6b1c, is problematic.  Due to numerous
bugs we'll soon remove it.  As a first step and for all branches back to
14, stop using PQsendQuery in libpq_pipeline.  Also remove a few test
lines that will no longer be relevant.

Backpatch to 14.

Discussion: https://postgr.es/m/CA+mi_8ZGSQNmW6-mk_iSR4JZB_LJ4ww3suOF+1vGNs3MrLsv4g@mail.gmail.com

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