Collect PR review policies

[grst]

For #regulatory, it would be great to record for each pipeline

• who can merge PRs (everyone from community or just maintainers)?
• PR review settings, i.e. are PR reviews enforced for
  • releases
  • PRs to dev

[grst]

This is already available on https://nf-co.re/pipeline_health

The metrics are available in https://nf-co.re/pipelines.json

[grst]

I think it's easier to get this directly from pipelines.json for now rather than going through the stats database. Closing.