fix: authz compat layer was failing on libraries v2 keys

[rodmgwgu]

Description

Follow up on #38013

The code on the RBAC AuthZ compatibility layer for course authoring was querying for all roles assigned to a user, which also included library v2 permissions, which the CourseKey class was not expecting and causing an exception.

Added filtering so only courses-v1 role assignments are returned.

Supporting information

Bug reported by @BryanttV

Testing instructions

N/A

Deadline

Verawood release

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