Revert Default to PostgreSQL 12 in fresh installs
What does this MR do?
Reverts !4664 (merged) for now as we have decided to delay this change another release. As we have run into some issues with patroni's failover, and we want to fix those before making PG 12 the default for fresh installs.
Related issues
Closes #5798 (closed)
Reopens #5509 (closed)
Checklist
See Definition of done.
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Edited by DJ Mountney