Improve ai.ai_prompt schema
>>> [!note] Migrated issue
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Reported by: [svendecabooter](https://www.drupal.org/user/35369)
Related to !921
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>The `ai.ai_prompt.*` schema definition seems to specify non-existing properties, and could use extra validation.</p>
issue