Expose cycle analytics stages and events
What does this MR do?
This MR is part of the customizable Cycle Analytics backend feature. It exposes a JSON structure that will be used by the frontend to build up the stage list.
The stages can be loaded for a specific group with the group_id parameter:
/-/analytics/cycle_analytics/stages?group_id=$GROUP_FULL_PATH
Note: cycle_analytics_for_groups license is required and cycle_analytics feature flag needs to be enabled.
Example response: stages.json
The stages can be persisted into the database (feature not merged yet), this commit only returns the available stages that are coming with the default cycle analytics feature: https://about.gitlab.com/product/cycle-analytics/
Note: This MR contains a small set of changes to facilitate the review process, more MRs will follow.
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