If a user invokes pytorchbot merge while signing off on the PR, github classifies the comment as a "review comment" instead of a "direct comment."

Direct comments are correctly handled by mergebot, but not review comments. This has led to multiple occurrences where devs try to merge changes they're reviewing, but it fails

The ask:

Do one of the following:

• Prevent pytorchbot from doing anything during a review comment, asking users to use a direct comment instead to merge their changes
• (Preferred) Make pytorchbot handle merges from review comments as well. This will prob require searching the github graphql api for the reviewcomment

Additional context

This is a review comment:

cc @kit1980 @huydhn @clee2000