Verify zero downtime upgrade from 14.3 to 14.4

• Build environment with GET (2 Rails, 1 HAProxy) GitLab 14.3
• Configure HAProxy to send API requests to 1 Rails node (API) and all other calls to the Rails node (UI)
• Upgrade to 14.4 on the UI Rails node
  • Upgrade with the FF paginated_tree_graphql_query disabled and expect failure
  • Rebuild and upgrade with FF paginated_tree_graphql_query enabled and ensure success