* Remove dependency to psycopg2 with dump/restore
'dump' and 'restore' state only need pg_dump and pg_restore. These tools
don't use psycopg2 so this change tries to avoid the use of it in these
cases.
The db_exists test was replaced with an error detection when piping to
compression program, using a FIFO file. This effectively reverts #39483,
that was a fix for #39412.
* Fix typo
* Add changelog fragment
* Add note for dump and restore not requiring psycopg2
* Fix YAML syntax
* Update lib/ansible/modules/database/postgresql/postgresql_db.py
Co-Authored-By: Glandos <bugs-github@antipoul.fr>
