Fix N+1 for commits with pipelines

What does this MR do?

The Ci::Pipeline data (latest_pipeline) loaded in the CommitPresenter causes N+1. This MR fixes that by using BatchLoader for latest_pipeline.

This is an example search on production that has this N+1 issue.

#227383 (closed)

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

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Related to #227383 (closed)