Use Interfaces instead of Class names in AgentHelper and AiAgentBase
>>> [!note] Migrated issue
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<!-- Migrated from issue #3499719. -->
Reported by: [christian.wiedemann](https://www.drupal.org/user/861002)
Related to !48
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>The AgentHelper uses ModuleHandler instead of ModuleHandlerInterface and AiAgentBase user FileSystem instead orf FileSystemInterface </p>
issue