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[APER-3229] The monolith and the Credentials IDA keep independent records of a course runs certificate availability/visibility preferences. This PR aims to improve the communication between the monolith and the Credentiala IDA to keep the availability date/preference in sync with the monoliths records. The current code is too strict and actually prevents valid updates in some configurations. Additionally, the Credentials IDA doesn't understand the concept of "course pacing" (instructor-paced vs self-paced) and has troubles with courses with an availability date of "end". Instead of having to add the concept of course pacing (and syncing more data between the two systems), this PR proposes sending the end date of a course as the "certificate available date" to Credentials. This way, the Credentials IDA can manage the visibility of awarded credentials in a course run with a display behavior of "end" using the existing feature set and models of the Credentials service.
Open edX -------- This is the root package for Open edX. The intent is that all importable code from Open edX will eventually live here, including the code in the lms, cms, and common directories. If you're adding a new Django app, place it in core/djangoapps. If you're adding utilities that require Django, place them in core/djangolib. If you're adding code that defines no Django models or views of its own but is widely useful, put it in core/lib. Note: All new code should be created in this package, and the legacy code will be moved here gradually. For now the code is not structured like this, and hence legacy code will continue to live in a number of different packages.