feat: add ol-openedx-course-sync plugin

[asadali145]

What are the relevant tickets?

https://github.com/mitodl/hq/issues/7197

Description (What does it do?)

Adds a new plugin to sync changes from one course to other courses named ol-openedx-course-sync.

How can this be tested?

• Build the package using pants
• Install in the cms and restart the cms
• go to the CMS shell and run the CMS migrations
• Now to the CMS admin, you will see 2 models Course Sync Parent Orgs and Course Sync Maps
• Add the source Org in the Course Sync Parent Orgs.
  • This organization will act as the source organization and will be used to sync changes to rerun/target courses.
• Now create a new course for this organization in the CMS.
• Add some content in the course.
• Now create a rerun for this course in the CMS. Rerun can be in the same or different organization.
• Go to the CMS admin model Course Sync Maps and verify the newly added entry. Verify the source course and target course values.
  • Create different runs/courses with same/different orgs and verify the model data.
  • Model will not add a source to any other source or target courses to avoid sync loops.
• You can change/update source and target courses manually.
• Now make changes in the source course, changes should propagate to the target courses.
• Unpublished and published changes should remain in the same state
• Learner progress should be retained
• Test different types of problems.
• Test any other cases as needed.

[arslanashraf7]

It is not a full code review, but I skimmed through the code and it looks fine to me.

I tested this on multiple scenarios and it works fine as per my testing.

1. Tested it with different course outline units
2. Tested it with a mix of published and draft outlines
3. Tested it with the grading policy, and that also gets copied into re-runs
4. Tested the progress as a student in a re-run, and that worked fine too
5. Tested with large courses, it does take some time, but it works for them too
6. Tested it with course re-runs for different organizations, and it worked, Although it takes some time.

We will have to make some optimizations here. Ideally, run the copy operation in celery tasks. It would be great if we could use the same mechanism as edX's Insturctor Tasks/Model to be able to trace errors and progress via the instructor tasks API if needed.

[asadali145]

We will have to make some optimizations here. Ideally, run the copy operation in celery tasks. It would be great if we could use the same mechanism as edX's Insturctor Tasks/Model to be able to trace errors and progress via the instructor tasks API if needed.

Sure, I will refine code + do this once I get a go ahead.