Disable force_parallel_mode in libpq_pipeline

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

Commit: a6d3dea8e5e0c8a0df2f95d66b6c3903a4354ca0
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2021-03-31T21:45:25Z
Releases: 14.0
Disable force_parallel_mode in libpq_pipeline

Some buildfarm animals with force_parallel_mode=regress were failing
this test because the error is reported in a parallel worker quicker
than the rows that succeed.

Take the opportunity to move the SET of lc_messages out of the traced
section, because it's not very interesting.

Diagnosed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/3304521.1617221724@sss.pgh.pa.us

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