refactor: migrate course_details + grading callers to standardized v3 APIs (FC-0118)

[taimoor-ahmed-1]

Description

Part of the FC-0118 downstream migration tracked in #3127. Points two of the
Ready Studio API callers at their standardized v3 endpoints. Pure
URL/verb version bumps — no UI or behaviour change for Course Authors.

Commits (one per API, so each can be reviewed / rolled back independently):

1. course_details → v3 — getCourseDetails (GET) and updateCourseDetails
   (PUT) now target /api/contentstore/v3/course_details/{course_id}/. The v3
   ViewSet supports the same GET+PUT and returns the same CourseDetailsSerializer
   shape. Both call sites are migrated (schedule-and-details and the duplicate
   in course-outline) so all course-details reads land on v3.
2. course_grading write → v3 authoring_grading — the save
   (sendGradingSettings) moves from POST v1/course_grading to
   PATCH v3/authoring_grading/{course_id}/, which collapses the old GET+POST
   pair into a single partial_update. Same serializer payload is returned.

Note — grading read stays on v1 (intentional). The v3 authoring_grading
ViewSet only exposes the write (partial_update); it has no GET. So
getGradingSettings remains on v1/course_grading until a v3 read endpoint
exists. This is called out in a code comment.

The trailing slash on both v3 URLs is required — v3 is served by a DRF
DefaultRouter (the v1 APIViews had none). Omitting it would 301-redirect and
drop the request body on PUT/PATCH.

User roles impacted: Course Author (Studio Schedule & Details, Grading
Settings pages). No visible change expected.

Supporting information

• Tracking issue: Migrate Studio API callers to standardized v3/v4 endpoints (FC-0118) #3127
• Backend ADRs / PRs (on openedx/edx-platform, branch feat/axim-api_improvements):
  Course Details v3 (#38708), Author Grading v3 (#38726), ADR 0031 (merge
  endpoints), ADR 0037 (versioning).
• Out of scope here (deferred): Xblock legacy→v1 REST (own PR — it needs
  per-call-site verb changes, not a URL swap), the ADR 0029 error-handling
  wrapper (own PR), and Course Home [BD-03] [BB-2542] ]Add discussions configuration UI wireframe in MFE #2 / Home Courses adds transifex config and test string #3 (on hold pending Switch from Redux to React Query + Context #2540).

Testing instructions

1. Open a course in Studio → Settings → Schedule & Details. Confirm the page
   loads and saving changes persists (network calls hit .../v3/course_details/<id>/).
2. Open Settings → Grading. Confirm current grading loads (GET
   .../v1/course_grading/<id>) and that saving persists (PATCH
   .../v3/authoring_grading/<id>/).
3. npm test — updated suites: ScheduleAndDetails.test.tsx (13 passing),
   GradingSettings.test.jsx (12 passing), course-outline spot-check green.

Other information

• Depends on the v3 endpoints landing on edx-platform (feat/axim-api_improvements).
  The old versions remain live, so this is safe to merge once v3 is deployed.
• No migrations, no accessibility impact.

Best Practices Checklist

• Any new files are using TypeScript — N/A (no new files)
• Avoid propTypes/defaultProps in new/modified code
• Tests use initializeMocks from src/testUtils
• No new Redux state
• Data loaded via React Query (apiHooks)
• New i18n messages have description — N/A (no new messages)
• No ../ added to import paths

[openedx-webhooks]

Thanks for the pull request, @taimoor-ahmed-1!

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.76%. Comparing base (c1da7f4) to head (cf76b86).

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #3136    +/-   ##
========================================
  Coverage   95.76%   95.76%            
========================================
  Files        1396     1396            
  Lines       33308    33312     +4     
  Branches     7820     7566   -254     
========================================
+ Hits        31897    31901     +4     
- Misses       1352     1367    +15     
+ Partials       59       44    -15     

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