* feat: upgrade react router to v6
* fix: all test cases affected by react router upgrade
* refactor: fix navigations
* fix: test cases affectewd due to lib-special-exams
* refactor: improve code coverage
In an attempt to debug some odd LMS errors (which would happen if
you loaded an MFE page with spaces instead of plus signs), this
commit notices page requests with spaces in the course key and
switches it out for plus signs, logging the incident.