libpq_pipeline: Test the default protocol version

In preparation for a future change to libpq's default protocol version,
pin today's default (3.0) in the libpq_pipeline tests.

Patch by Jelte Fennema-Nio, with some additional refactoring of the
PQconnectdbParams() logic by me.

Author: Jelte Fennema-Nio <[email protected]>
Discussion: https://postgr.es/m/DDPR5BPWH1RJ.1LWAK6QAURVAY%40jeltef.nl

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/9b9eaf08ab2dc22c691b22e59f1574e0f1bcc822

Modified Files
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src/test/modules/libpq_pipeline/libpq_pipeline.c | 50 ++++++++++++++++--------
1 file changed, 34 insertions(+), 16 deletions(-)

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