use PGBOUNCER_PREPARED_STATEMENTS env var for all connection…

in order for pgbouncer to work correctly we need to disable prepared statements.
this patch ensures the `PGBOUNCER_PREPARED_STATEMENTS` env var is used.

prior to this patch, the logs database would require a `LOGS_PGBOUNCER_PREPARED_STATEMENTS` var.

Igor authored GitHub committed

Nothing here #121.2 passed

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