Default to PG 11 for fresh installs
This is the pieces from !4046 (closed) for #5092 (closed) that deal with fresh installs. Skipping the changes to upgrade.
I think this change is more clear in terms of being able to go in for this release. While the pg-upgrade related changes might be blocked on further improvements to dealing with Geo and HA nodes.
Edited by GitLab Release Tools Bot