Hidden field can never be required. Skip that validation (#716)

* Hidden field can never be required. Skip that validation

* Refactor form logic editor UI with improved text and styling

- Replace UAlert with plain text description
- Update action description text
- Remove help text from select input
- Simplify note about hidden field requirements

* Add test for form logic field visibility and validation

- Implement test case for fields hidden by logic conditions
- Update AnswerFormRequest to use new FormLogicPropertyResolver method for hidden field check
- Ensure required fields are skipped when hidden by form logic

---------

Co-authored-by: Julien Nahum <julien@nahum.net>

client/components/open/forms/components/form-logic-components/FormBlockLogicEditor.vue

@@ -45,6 +45,9 @@
     <h5 class="font-medium text-gray-700 mt-3">
       2. Actions
     </h5>
+    <p class="text-gray-500 text-xs mb-3">
+      Action(s) triggered when above conditions are true.
+    </p>
     <flat-select-input
       :key="resetKey"
       v-model="logic.actions"
@@ -52,11 +55,14 @@
       :multiple="true"
       class="mt-1"
       placeholder="Actions..."
-      help="Action(s) triggered when above conditions are true"
       :options="actionOptions"
       @update:model-value="onActionInput"
     />
 
+    <p class="text-gray-500 text-xs mb-3">
+      Note that hidden fields can never be required.
+    </p>
+
     <modal
       max-width="sm"