Put libpq_pipeline cancel test back

I disabled it in cc6e64afda53 because it was unstable; hopefully the
changes here make it more stable.  (Jelte proposed to submit the queries
using simple query protocol, but I chose to instead make the monitor
connection wait until the PgSleep wait event is seen.  This is probably
not a terribly meaningful increase in coverage ...)

Discussion: 
https://postgr.es/m/CAGECzQRQh_5tSy+5cndgv08eNJ2O0Zpwn2YddJtSsmC=wpy...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/6b3678d3474ff456b3229e4829c595be1c0c2888

Modified Files
--------------
src/test/modules/libpq_pipeline/libpq_pipeline.c | 37 ++++++++++++++----------
1 file changed, 22 insertions(+), 15 deletions(-)

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