Update symlinks of postgres on both upgrade and reconfigure
Builds on top and superseds https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/1120 and https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/1114
Fixes #1726 (closed)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Builds on top and superseds https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/1120 and https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/1114
Fixes #1726 (closed)