Clarify when ExpectedExit should be used #1675

Currently (84629b5), we only use ExpectedExit in bump command. I believe it'd be better if we can make the pattern of each command more consistent.

1. Is there a historical reason why we have ExpectedExit?
2. Can we replace it with a normal return? (Probably a breaking change)
3. Should we add ExpectedExit to every other commands?