Remove unused StringTranslationTrait from FormHooks service.
>>> [!note] Migrated issue
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<!-- Migrated from issue #3542343. -->
Reported by: [rduterte](https://www.drupal.org/user/3809153)
Related to !9
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>The `FormHooks` service includes `StringTranslationTrait` but does not use it.<br>
Keeping unused traits adds unnecessary code and may confuse maintainers.</p>
<h4 id="summary-steps-reproduce">Steps to reproduce</h4>
<p>Review the `FormHooks` class in the `config_warning` module.<br>
The `StringTranslationTrait` is imported and used, but `$this->t()` or any other method from the trait is never called.</p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>Remove the `StringTranslationTrait` from the FormHooks service. </p>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<p>- [ ] Remove the unused trait from the codebase.<br>
- [ ] Confirm manually that no regressions are introduced.<br>
- [ ] Automated tests will cover this in !<a href="https://www.drupal.org/project/config_warning/issues/3535448">3535448</a> (currently in review).</p>
<h3 id="summary-ui-changes">User interface changes</h3>
<h3 id="summary-api-changes">API changes</h3>
<h3 id="summary-data-model-changes">Data model changes</h3>
issue