Remove leftover code (AiAgent::getRetries)
>>> [!note] Migrated issue
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Reported by: [justanothermark](https://www.drupal.org/user/1369624)
Related to !76
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>Due to the fast moving nature of the AI Agents module and related AI modules, there are bits of code left in AI Agents that aren't used and can cause confusion when trying to work on other features/bugs.</p>
<p>An example of this is that various <code>AiAgent</code>s implement a <code>getRetries()</code> method that is no longer part of the base class or interface and is not called from anywhere. These methods are all documented with <code>{@inhertidoc}</code> even though there is nothing to inherit from.</p>
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