R1:fab37aa4e35a

When accepting revisions, allow users to accept on behalf of a subset of reviewers

Summary:
Ref T12271. Currenty, when you "Accept" a revision, you always accept it for all reviewers you have authority over.

There are some situations where communication can be more clear if users can accept as only themselves, or for only some packages, etc. T12271 discusses some of these use cases in more depth.

Instead of making "Accept" a blanket action, default it to doing what it does now but let the user uncheck…