Who can approve backport PRs? Can I approve a backport of a PR I created? Or does that require a second set of eyes? Like these: https://github.com/pantsbuild/pants/pull/20494 https://github.com/pantsbuild/pants/pull/20484 https://github.com/pantsbuild/pants/pull/20483 Can I just approve them and merge it myself?

Yea, I don't think we've bothered with more eyes on backports. The original change was reviewed already.