fix: correctly handle multi-word class names in array resource adapter

[Paul-Bob]

Description

Fixes part of #3680

The ArrayResource was incorrectly using name instead of class_name to define the backbone class. This caused errors when working with multi-word resources such as Avo::Resources::DisplayName.

This fix ensures that class_name is used correctly.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

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[github-actions]

This PR has been merged into main. The functionality will be available in the next release.

Please check the release guide for more information.