psql: Add test for query canceling

Query canceling in psql was accidentally broken by
3a5130672296ed4e682403a77a9a3ad3d21cef75 (since reverted), so having
some test coverage for that seems useful.

Reviewed-by: Fabien COELHO <coe...@cri.ensmp.fr>
Discussion: 
https://www.postgresql.org/message-id/18c78a01-4a34-9dd4-f78b-6860f1420...@enterprisedb.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/5b3f471ff23a2773e6c1ee1704377581c987107d

Modified Files
--------------
src/bin/psql/t/020_cancel.pl | 40 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)

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