feat: make PermissionValidationMeView aware of the course-authoring flag

[mariajgrimaldi]

Description

Currently, the validate/me endpoint only checks Casbin permissions, so it could say a user is allowed on a course whose waffle flag is off. An additional check was implemented to validate whether the scope is visible at the platform (site-wide), org, or course level, meaning the waffle flag actually resolves to on for that scope (see ADR 0015).

Merge checklist:
Check off if complete or not applicable:

• Version bumped
• Changelog record added
• Documentation updated (not only docstrings)
• Fixup commits are squashed away
• Unit tests added/updated
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[mariajgrimaldi]

This PR was meant to partially solve #340 & #341 by supporting the proposal made here openedx/frontend-app-admin-console#176 (comment) for the Verawood release - returning False for scopes based on the waffle flag state. But the approach still needs to address other dimensions, such as the performance and correctness of the entire framework, especially since these issues are release blockers and the modified endpoints are critical to the system's functionality. Internally, we discussed the best solution moving forward, given that we shouldn't introduce big changes that put the framework's correctness at risk, and went ahead with #358 and supporting filtering via the admin-console MFE. This will definitely introduce complexity to the MFE logic, which will be addressed in the next release cycle.