feat: add new content library enforcement points

[BryanttV]

Description

This PR adds missing authorization enforcement points for Content Libraries v2, aligning tagging and reuse operations with the new granular authz permissions (notably MANAGE_LIBRARY_TAGS and REUSE_LIBRARY_CONTENT). Currently, some operations on Content Libraries v2 rely on generic edit/view permissions instead of the more specific g2 authz permissions

What This PR Changes

• New helper for library tagging access

  • Adds has_library_tagging_access(user, library_key). This helper looks up the ContentLibrary object and checks MANAGE_LIBRARY_TAGS via user_has_permission_across_lib_authz_systems.

• Updated tagging rules for library content

  • Updates can_change_object_tag_objectid. If the context is a LibraryLocatorV2, it now uses has_library_tagging_access and therefore requires MANAGE_LIBRARY_TAGS. For other contexts (courses, XBlocks, etc.), it still falls back to has_studio_write_access as before.

• New enforcement for content reuse flows

  • The LibraryPasteClipboardView now requires authz_permissions.REUSE_LIBRARY_CONTENT instead of the legacy CAN_EDIT_THIS_CONTENT_LIBRARY permission.
  • The ClipboardEndpoint now also requires REUSE_LIBRARY_CONTENT (rather than CAN_VIEW_THIS_CONTENT_LIBRARY) when bringing content from a library into a course.

• Authz-to-legacy permission mapping updates

  • In _transform_authz_permission_to_legacy_lib_permission is extended so that:
    • MANAGE_LIBRARY_TAGS → CAN_EDIT_THIS_CONTENT_LIBRARY
    • REUSE_LIBRARY_CONTENT → CAN_VIEW_THIS_CONTENT_LIBRARY
  • This keeps the legacy permission layer in sync with the new authz permissions.

Supporting information

• Add enforcement points for manage_library_tags and reuse_library_content openedx-authz#154

Testing instructions

You can test the following endpoints:

REUSE_LIBRARY_CONTENT

All library roles (Library Admin, Library Author, Library Contributor, and Library User) can reuse library content:

• POST {studio_domain}/api/content-staging/v1/clipboard/: Copy content to the clipboard.
• POST {studio_domain}/api/libraries/v2/{library_key}/paste_clipboard/: Paste content from the clipboard into a library.

MANAGE_LIBRARY_TAGS

All library roles (except Library User) can manage (add or remove) tags for content in a library:

• PUT {studio_domain}/api/content_tagging/v1/object_tags/{object_key}/: Add or remove tags from library content.

You can use the following Postman Collection.

Deadline

None

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