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What does this PR do?
This PR adds a flag in the postgres check to use psycopg2 instead of pg8000
Motivation
See discussion at #2755
Testing Guidelines
Added a test that enables this flag. Also modified existing test to make sure it keeps using pg8000 by default.
Additional Notes
Some other approaches more "global" could be tempting, but they wouldn't let the possibility to do it on a per instance basis.