refactor(catalog): rely on inventory for variant availability

app/Domains/Catalog/Requests/CatalogVariantOptionsRequest.php

@@ -17,8 +17,6 @@ class CatalogVariantOptionsRequest extends FormRequest
         return [
             'selected_values' => ['sometimes', 'array'],
             'selected_values.*' => ['nullable'],
-            'excluded_variant_ids' => ['sometimes', 'array'],
-            'excluded_variant_ids.*' => ['integer', 'min:1', 'distinct'],
             'cart_item_id' => ['sometimes', 'nullable', 'integer', 'min:1'],
         ];
     }