feat: use granular permissions on course updates if authz authoring flag set

[wgu-taylor-payne]

Description

Use openedx-authz permissions for the Course Updates page in Studio when the AUTHZ_COURSE_AUTHORING_FLAG is enabled for the given course.

If the AUTHZ_COURSE_AUTHORING_FLAG is disabled then the legacy permission checks will occur.

The permission checks for the "Course handouts" section of Course Updates were handled in #38179.

Supporting information

Closes openedx/openedx-authz#191.

Testing instructions

For automated tests, run pytest on cms/djangoapps/contentstore/views/tests/test_course_updates.py.

To test manually, make sure that the AUTHZ_COURSE_AUTHORING_FLAG is enabled for the course you are testing, and that openedx-platform is using openedx-authz >= 0.22.0. Run manage.py cms load_policies to ensure latest casbin policies have been loaded and then assign course related roles to the users you are testing.

Navigate to the Course Updates page for the course (e.g. http://apps.local.openedx.io:2001/authoring/course/course-v1:OpenedX+DemoX+DemoCourse/course_info) and see if the updates load, whether you can add an update, edit an update, and delete an update.

Deadline

Verawood

Other information

Co authored with Kiro.

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