Valid courseware URLs currently include:
* /course/:courseId
* /course/:courseId/:sequenceId
* /course/:courseId/:sequenceId/:unitId
In this commit we add support for:
* /course/:courseId/:sectionId
* /course/:courseId/:sectionId/:unitId
* /course/:courseId/:unitId
All URL forms still redirect to:
/course/:courseId/:sequenceId/:unitId
See ADR #8 for more context.
All changes:
* refactor: allow courseBlocks factory to build multiple sections
* refactor: make CoursewareContainer tests less brittle & stateful
* feat: handle courseware paths more liberally
* refactor: reorder, rename, & comment redirection functions
TNL-7796
353964e75c