Move pipelines page to GraphQL - Part 3

What does this MR do and why?

Part one: !206072 (merged) ✅

Part two: !207467 (merged) ✅

Part three: YOU ARE HERE 😄

Goal: Move Build > Pipelines to use GraphQL as the SSOT for data. In part three we add GraphQL pagination.

References

Screenshots or screen recordings

How to set up and validate locally

1. First visit Build > Pipelines and ensure existing feature works as expected.
2. Next enable Feature.enable(:pipelines_page_graphql) feature flag
3. Visit Build > Pipelines again
4. Ensure pagination works as expected.
5. It's okay that the rest is missing and broken (filtered search, tabs etc), we are iterating here...

MR acceptance checklist

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Related to #223264