List group role assignments

Returns the roles assigned to the group. Members inherit these roles. Returns the shared role-assignment shape with principal_type set to group. Use cursor pagination via after/before; pass expand[]=total_count to include the matching row count. Pass filter[id] (repeatable, max 100) to restrict results to a known set of role assignments, mutually exclusive with after/before (returns 400 if combined). When filter[id] is set, limit is ignored and the response contains every requested assignment that exists on the group, in a single page. IDs not on the group are silently omitted.