fix: platform-wide glob role assignments crash get_orgs_for_user/has_org_for_user

[efortish]

Description

Fixes openedx-authz#380

RoleBase._authz_get_orgs_for_user() (common/djangoapps/student/roles.py) reads assignment.scope.org for every AuthZ assignment. However, PlatformGlobData (the course-v1:* / lib:* platform-wide scopes) does not have an .org attribute, unlike CourseOverviewData / OrgGlobData, where .org is a valid (possibly None) field.

As a result, any user with a role assigned at a platform-wide scope would cause get_orgs_for_user() / has_org_for_user() to fail with an AttributeError.

The fix handles platform-wide assignments before accessing .org. Since a platform-wide grant applies to every organization, the compatibility layer returns all registered organization short names instead of trying to derive them from individual assignments.

Testing Instructions

1. Enable the authz.enable_course_authoring flag globally.
2. Assign a user a role at the platform-wide glob scope (course-v1:*).
3. Call role.get_orgs_for_user(user) / role.has_org_for_user(user), or trigger any code path that uses them (e.g., the Studio course listing).
4. Verify that all organizations are returned and no AttributeError is raised.

Added test_get_orgs_for_user_authz_platform_glob in common/djangoapps/student/tests/test_roles.py to cover this case.

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