Publish preflight: Behavior can be tested and works as expected

### As a developer, I want good test coverage for custom logic so that I can confidently refactor and add features while ensuring that existing quality is maintained.
- [ ] Behavior should remain roughly as it currently is
- [ ] If user clicks "save as draft" and has at least the title filled out, then no error messaging is returned.
- [ ] If user clicks "publish" and some required fields are missing, then page with page-level error message and component-level error messages/design for each required component is returned.
- [ ] In the rare case that user attempt to save as draft without a title, then behavior remains the same as current implementation, ie, the field shows error, but if user backs out without change, then previous title is used.