Trigger mergeRequestMergeStatusUpdated when pipeline starts, fails, skipped, or succeed

Problem to solve

We want the merge widget to show updated status when pipelines on the MR starts, fails, skipped or succeed.

Proposal

Trigger the mergeRequestMergeStatusUpdated subscription when:

• MR head pipeline transitioned to running
• MR head pipeline has failed
• MR head pipeline was created but skipped
• MR head pipeline succeeds

We can trigger the subscription in Ci::Pipeline's status state machine via after_transition to running, failed, skipped, and success states. Ensure that this is done after commit so we don't affect the state update when redis call fails for some reason.

Put it behind a feature flag so we can easily disable it if something goes wrong.

Testing

Exploratory testing and feature specs of merge widget status when pipeline running/failed/skipped/success If the above cannot be covered in feature spec, an E2E test may need to be created Run package and e2e test job in MR.

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