Clean up ai_observability settings form
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3574499. -->
Reported by: [svendecabooter](https://www.drupal.org/user/35369)
Related to !1221
>>>
<p>[Tracker]<br>
<strong>Update Summary: </strong>[One-line status update for stakeholders]<br>
<strong>Short Description: </strong>[One-line issue summary for stakeholders]<br>
<strong>Check-in Date: </strong>MM/DD/YYYY<br>
<em>Metadata is used by the <a href="https://www.drupalstarforge.ai/" title="AI Tracker">AI Tracker.</a> Docs and additional fields <a href="https://www.drupalstarforge.ai/ai-dashboard/docs" title="AI Issue Tracker Documentation">here</a>.</em><br>
[/Tracker]</p>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>It seems the \Drupal\ai_observability\Form\SettingsForm can use some cleanup / removal of unnecessary code:</p>
<ul>
<li>Uses both #default_value and #config_target. The former is not needed if the latter is used.</li>
<li>Simplify constants</li>
<li>...</li>
</ul>
issue