release finish: Make sure QA label is checked

Issue
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On release finish, qa+ label was not checked so all the stories were
released even though they were not marked as QA'd.

Solution
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Iterate over all the stories and look for qa+ label before doing
anything else.

release finish was also a bit refactored to perform the release steps in
a different order so that it makes more sense, i.e. the more important
operations and checks are performed first.