ClassifAI panel shows even if NLU feature is turned off

[dkotter]

Describe the bug

We added more advanced role and user based access in #606. In testing something else today, I noticed that if I uncheck the Classify content option for the Watson NLU feature but I leave the Enable role-based access option on and set to my role, the ClassifAI panel still shows in the editor, though it is empty. Seems we should remove this panel all together if it isn't needed.

In addition, also noticed that the language-processing.css file seems to load if the NLU feature is turned off but the role-based access is turned on. Wondering if we have some sort of conditional that needs fixed up to ensure the main feature toggle takes precedence and then we look at user and role based access only if the feature is turned on.

Steps to Reproduce

1. Uncheck the Classify content option for the NLU feature
2. Check Enable role-based access
3. Ensure your role is in the allowed list
4. Go to a post and see the ClassifAI panel in the sidebar

Screenshots, screen recording, code snippet

Environment information

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WordPress information

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