Use CourseRun Model & Add Admin Page

[kdmccormick]

Description

Add openedx-core as a dep and use its openedx_catalog CourseRun model, which demonstrates our new stable core APIs a bit.

Also, adds an admin page, which shows the FK relationship, and is also just a great practice for plugins to follow.

Testing

I tested that the feature still works as it did before. Here's the admin page:

Note that I had to un-migrate and re-migrate, since the models are rewritten in-place rather than smoothly migrated with a 0002:

tutor dev run lms ./manage.py lms migrate openedx_plugin_sample zero
tutor dev run lms ./manage.py lms migrate openedx_plugin_sample

AI

Claude wrote it, I reviewed it, and I had it simplify the implementation a bit before committing. Main prompts:

within backend-plugin-sample/.venv, i've installed openedx-core, whose openedx_catalog djangoapp include a CourseRun django model. rather than having a CourseKeyField on CourseArchiveStatus, I'd like a foreign key to CourseRu. check out the docstrings in openedx_catalog; they will help.

oh, i forgot mention: no need to migrate the data smoothly. clobber the existing 0001 migration for openedx_plugin_sample and re-generate with ./manage.py makemigrations

awesome. next up, could you make a standard django admin page for our sample plugin and its one model?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.04%. Comparing base (1291e3e) to head (176be8c).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
+ Coverage   92.60%   93.04%   +0.44%     
==========================================
  Files          16       16              
  Lines         473      503      +30     
  Branches       18       18              
==========================================
+ Hits          438      468      +30     
  Misses         24       24              
  Partials       11       11              

Flag	Coverage Δ
unittests	93.04% <ø> (+0.44%)	⬆️

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