Display program requirements

[ChristopherChudzicki]

What are the relevant tickets?

• Closes https://github.com/mitodl/hq/issues/8827

Description (What does it do?)

This PR adds the requirements display for program pages in MIT Learn.

Screenshots (if appropriate):

How can this be tested?

1. Prerequisites:
   • MIT Learn <> MITxOnline integration setup as directed in this repo readme.
   • An MITxOnline program with required and elective courses, published. Also a corresponding CMS page with "include in learn catalog" set to true.
   • ETL set up to ingest local MITxOnline data, e.g.,

     MITX_ONLINE_BASE_URL=http://mitxonline.odl.local:8013/
     MITX_ONLINE_COURSES_API_URL=http://host.docker.internal:8013/api/v2/courses/
     MITX_ONLINE_PROGRAMS_API_URL=http://host.docker.internal:8013/api/v2/programs/
     

2. Run ./manage.py backpopulate_mitxonline_data
3. Visit http://open.odl.local:8062/programs/PROGRAM_READABLE_ID.
4. Check that the required courses show up as course cards; clicking them should open the drawer. Mobile view should show cards as in screenshot above.
5. Check that the elective courses show up with correct value for "take this many electives" display.
6. Check that the required + elective course section titles are dynamic, reading from data in http://mitxonline.odl.local:8013/admin/courses/program/PROGRAM_ID/change/

[gumaerc]

LGTM!