MR widget subscription - Real-time pipeline updates on merge requests

What does this MR do and why?

Adds subscription to MR widget to give users real-time pipeline status and stage status updates. Also lays framework to set upstream data fast that deals with pipelines for mergeability checks in the future.

References

Screenshots or screen recordings

Screenshot_2026-03-24_at_3.13.34_PM

How to set up and validate locally

  1. echo "Feature.enable(:mr_widget_pipeline_subscription)" | gdk rails c
  2. Visit a MR with pipelines
  3. Trigger pipeline changes (ensure pipeline widget accurately reflects status changes quickly)
  4. Merge the MR
  5. Test out the merge pipeline as well

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #593409

Edited by Payton Burdette

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