[mariajgrimaldi]

WIP

Description

The applet model separates course-team role definitions from the permissions contributed by each capability. This means a static role such as course_staff must be valid before any role extension adds permissions. The current JSON Schema requires every role to contain at least one permission, although validation, compilation, and rendering already support an empty base role.

This PR gives role definitions their own permission-list schema, which allows an empty list. The permission lists used by role_extensions keep their existing non-empty requirement, so an extension that declares add_permissions or remove_permissions must still include at least one permission.

Merge checklist:
Check off if complete or not applicable:

• Documentation updated (not only docstrings)
• Fixup commits are squashed away
• Unit tests added/updated
• Manual testing instructions provided
• Noted any: Concerns, dependencies, migration issues, deadlines, tickets

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[mariajgrimaldi]

Superseded by #548, which uses the branch from openedx/openedx-authz.