Ensure new pipelines are merged from subscription

What does this MR do and why?

When rolling out #223264 I realized new pipelines that come in are not updated in the list. This MR adds a use-case to handle that.

References

Screenshots or screen recordings

Screenshot_2025-11-10_at_11.22.01_AM

How to set up and validate locally

  1. Enable Feature.enable(:pipelines_page_graphql) && Feature.enable(:ci_pipeline_statuses_updated_subscription) feature flags
  2. Create a new pipeline
  3. Ensure it gets added to the list

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 #223264

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