expand all 'only: editors' to stats-editors as well

[mpadge]

@xuanxu Can you please give feedback here on the one potential issue that the stats-editors team this adds to the config is a sub-team of editors. I think original idea was to have stats-editors as a strict subset, but we currently have entries in stats-editors who are not in editors. Might be best for us to ensure strict subset on our org side, rather than merge this PR? @maelle what are your thoughts?

[xuanxu]

This change will grant access to all people in editors and to all people in stat-editors. Ideally is better to have a team with all the people (and just the people) you want to be able to use those commands, but if you trust everyone in both these teams I think there's no problem.

[mpadge]

We no longer need this, as we updated the team structures instead, so I'm going to close