Add cshs widget support to ClassificationOptionsSelect FieldWidgetAction
>>> [!note] Migrated issue
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Reported by: [petar_basic](https://www.drupal.org/user/3626336)
Related to !1354
>>>
<p>[Tracker]<br>
<strong>Update Summary: </strong>New feature - adding cshs widget support<br>
<strong>Short Description: </strong>[One-line issue summary for stakeholders]<br>
<strong>Check-in Date: </strong>MM/DD/YYYY<br>
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[/Tracker]</p>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>The `ClassificationOptionsSelect` FieldWidgetAction only supports `options_select` and `chosen_select` widgets. Fields using the `cshs` (Client-side Hierarchical Select) widget don't get an AI classification button, even though cshs is a common choice for hierarchical taxonomy fields.</p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>Add `'cshs'` to the `widget_types` array in the `ClassificationOptionsSelect` plugin attribute. The cshs widget creates a `target_id` sub-element, same as options_select and chosen_select, so it's fully compatible.</p>
<p>Follows the same pattern as chosen_select support added in #3546465.</p>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<h3>Optional: Other details as applicable (e.g., User interface changes, API changes, Data model changes)</h3>
<h3 id="summary-ai-usage">AI usage (if applicable)</h3>
<p>[x] AI Assisted Issue<br>
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<p>[ ] AI Assisted Code<br>
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<p>[ ] AI Generated Code<br>
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<p>[ ] Vibe Coded<br>
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