- Adds a non-passing cert learner course exit screen
- Moves all the logic about what course-exit mode we're in into
a utility method in the course-exit folder
- Moves all the logic about how the 'Next' button should read into
a utility method in the course-exit folder
* AA-196 course celebration cert
* AA-196: Course Celebration for passing Verified Learners
Co-authored-by: Dillon Dumesnil <ddumesnil@edx.org>
Note: This PR is being merged in somewhat incomplete as we decided to split off the work into a couple of other tickets. For example, the UI styling is not complete and I plan to also take another look at the routing. These code paths are not in use yet as the `courseExitPageIsActive` will always be False.
