[Meta] Path to GA for Omnibus GitLab HA

This is a tracking issue for the work we need to do to complete make HA for Omnibus GitLab generally available

• Improve HA configuration of GitLab: https://gitlab.com/gitlab-org/omnibus-gitlab/issues/2452
• Automated failover: https://gitlab.com/gitlab-org/omnibus-gitlab/issues/2571
• Documentation: https://gitlab.com/gitlab-org/omnibus-gitlab/issues/2572, https://gitlab.com/gitlab-org/omnibus-gitlab/issues/2825

General HA issues: https://gitlab.com/gitlab-org/omnibus-gitlab/issues?scope=all&utf8=✓&state=opened&label_name[]=HA

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