GitHub Apps should be able to leave PR reviews

GitHub Apps currently cannot add PR reviews.

This would be useful because unlike Check Runs (which apply to a given commit no matter the branch/PR it is in), PR reviews are scoped to a specific PR.

An example use case would be blocking PRs that don’t meet certain criteria (such a description in the PR body or title format).

Related issue:

Hi @rtsao,

Thanks for being here! And thank you for taking the time to write this feedback. I’ve taken your suggestion and passed it along to the appropriate teams. Thanks again for reaching out :grinning: