Manual queuing of stages

In YAML pipelines, a stage starts running as soon as its dependencies are satisfied. When you deploy to Production, this execution strategy isn't always the right choice. For example, you don't want that every pipeline run deploys to Production. Today, you can simulate manual queuing of stages by making use of environments and approvals & checks or the ManualValidation task, but doing so is tedious. We plan to give you the ability to define which stages run manually and to trigger such stages on demand.