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Disable unused coverage in MR pipeline list

Hordur Freyr Yngvason requested to merge remove-ff-merge_request_pipelines_list_disable_coverage into master

What does this MR do and why?

This completes the rollout of merge_request_pipelines_list_disable_coverage. When rendering pipeline lists on merge requests, we were serializing unused coverage data. This is expensive, especially for pipelines with lots of downstream pipelines, as each coverage report iterates over all builds in a pipeline, and each pipeline has its own coverage data.

To be extra safe, we rolled this out behind a feature flag. This flag has been live on GitLab.com now for over 24h without issues. Since this is a very high traffic page the flag should be safe to remove now.

See gitlab-com/gl-infra/production#17481 (closed)

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