feat: use authz permissions on xblock handler when enabled

[wgu-taylor-payne]

Description

Use openedx-authz permissions for the /xblock/ endpoint, when the AUTHZ_COURSE_AUTHORING_FLAG is enabled for the given course. The mapping between actions in the CMS and the associated permission is found in this document.

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

Supporting information

Closes #37925.

Testing instructions

Run pytest on the new test module cms/djangoapps/contentstore/tests/test_xblock_handler_permissions.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. Go though the actions outlined in the document linked above and verify that the correct permissions are checked and applied for the given user.

Deadline

Verawood.

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