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fix(psycopg): check connection health on pool checkout (#2285)

Connections silently dropped by the network while idle (firewall/LB
timeout, DB restart) were handed straight to callers, failing with
psycopg.OperationalError: the connection is closed. Pass psycopg_pool's
own check_connection callback so the pool validates and replaces dead
connections on checkout.

Fixes #2007

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