refactor: plugins reporting and versions hiding

[adrianthedev]

Description

• Fixes an issue with plugin reporting and hides the ruby/rails/avo aversions from the public.
• Adds the /avo/avo_private/status.txt path to quickly find out what you need
• hides all the private stuff behind the lightweight user_is_admin? or user_is_developer? flags

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.