feat: add AuthZ permissions for course schedule & details

[dwong2708]

Description

This PR introduces new AuthZ permission checks for the Schedule & Details section in course settings, implemented behind a feature flag.

The work follows the requirements defined in the ticket, covering both read and update operations for course schedule and details.

Scope of Changes

Permissions introduced:

• courses.view_schedule_and_details
• course.edit_schedule
• course.edit_details
• course.view_course

Endpoints updated:

GET /api/contentstore/v1/course_settings/{course_id}/
GET /api/contentstore/v1/course_details/{course_id}/
PUT /api/contentstore/v1/course_details/{course_id}/

All permission checks are gated behind the corresponding feature flag.

Implementation Details

• GET endpoints. Require courses.view_schedule_and_details permission.
• PUT endpoint
  • Handles updates for both schedule and details in a single request.
  • Introduce payload-level inspection to differentiate between schedule and details updates, and enforce permissions accordingly.
• Due to the merged data model (schedule + details updated together), enforcing separate permissions (course.edit_schedule vs course.edit_details) at field level would introduce additional complexity and performance overhead.

Testing instructions

Verified that:

• Authorized users can access the endpoints.
• Unauthorized users receive a 403 response.
• Legacy permission fallback works as expected.

Running relevant tests manually:

On a cms container (run with tutor dev exec cms bash), do:

pytest -p no:randomly --ds=cms.envs.test cms/djangoapps/contentstore/rest_api/v1/views/tests/test_course_details.py::CourseDetailsAuthzViewTest

pytest -p no:randomly --ds=cms.envs.test cms/djangoapps/contentstore/rest_api/v1/views/tests/test_settings.py

Deadline

Verawood

Other information

Closes openedx/openedx-authz#195

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[rodmgwgu]

Just some nits and changes needed due to other PRs already merged in master.

Please make sure to rebase from master to make sure nothing breaks.