feat: AuthZ for course authoring compatibility layer

[rodmgwgu]

Description

Part of the AuthZ for Course Authoring project.

Implemented a compatibility layer on legacy permission role checking for Course Authoring in studio.

This also covers legacy endpoints that are used for configuring course authoring permissions, so legacy views (like the one in instructor-dashboard) continue to work.

The objective of this task is to keep compatibility with existing codepaths that use the existing endpoints to manage roles related with course authoring.

Implementation details:

• Wether to use or change role assignations from the legacy or openedx-authz systems should be decided based on the flag implemented in Task - RBAC AuthZ - Implement feature flag to toggle between legacy and openedx-authz permission validation #37908
• Compatibility only applies to roles that exist both on the legacy and new AuthZ systems
• REST API stays the same for clients.

Supporting information

Closes: #37909
Related technical discovery documents:

• https://openedx.atlassian.net/wiki/spaces/OEPM/pages/5404590081/Technical+Discovery+Notes+-+AuthZ+for+Course+Authoring#Discovery-for-Course-Team-API-retrocompatibility
• https://openedx.atlassian.net/wiki/spaces/OEPM/pages/5639602177/Spike+-+RBAC+AuthZ+-+Understand+current+course+authoring+roles+and+permissions+logic+and+propose+reusable+solution#Understand-how-filtering-works-for-getting-bulk-objects-that-a-user-has-access-to

Testing instructions

Please provide detailed step-by-step instructions for testing this change.

Deadline

Verawood release.

Other information

Depends on: openedx/openedx-authz#217

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