Do not allow Omnibus to upgrade to v14.0 if Postgres not version 12

Minimally, when a user is installing/upgrading to Omnibus v 14.0 it should not be allowed if they are not using Postgres version 12 as the backing database.

changed milestone to %14.0

added Deliverable devopssystems groupdistribution priority2 sectioncore platform labels

assigned to @rmarshall

added to epic &3826 (closed)

mentioned in epic &3826 (closed)

mentioned in merge request !5348 (merged)

mentioned in commit f8bb478b

closed with merge request !5348 (merged)

mentioned in commit 87da882e

mentioned in merge request !5352 (merged)

mentioned in merge request !5355 (merged)

mentioned in merge request !5356 (merged)

mentioned in issue #6174 (closed)

mentioned in merge request !5372 (merged)