Returns the ordered list of stages that make up the specified pipeline, as an array of stage objects (e.g. id, name, icon) — not the full pipeline record (name, dates, etc.).

pipelineId can be an actual pipeline ID, or the special values default / default_pool for the company's default position pipeline or talent-pool pipeline. If pipelineId doesn't match a pipeline belonging to the company, the stages of Breezy's built-in default pipeline are returned rather than an error.