Full discussion is in #1048

"Exit Review Mode" makes it sound like all the reviewing feature (comments, views, etc.) will be removed. In actuality, all we're doing is checking out the default branch for the repository.

Ideally, this action should have a label that indicates that the default branch will be checked out using standard git terms and that this is the way to stop reviewing the current PR. Some options discussed:

• "Leave PR Branch"
• "Back to 'main'"
• "Checkout 'main'"
  None of these quite accomplish the above however. For now, we'll try "Checkout 'main'" and see how that goes.