Allow unsetting function call properties in AI tools
>>> [!note] Migrated issue
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<!-- Migrated from issue #3518004. -->
Reported by: [andrewbelcher](https://www.drupal.org/user/655282)
Related to !547
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>AI Agents has mechanisms to control the context values, and some times those should prevent the items being sent to the LLM at all.</p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>Add <code>\Drupal\ai\OperationType\Chat\Tools\ToolsFunctionInputInterface::unsetProperty</code></p>
issue