DEV: Add plugin outlet for below wizard field (#28371)

We changed the design of the member access wizard step to use toggle groups instead of switches. To support existing designs for notices, we need another plugin outlet.

app/assets/javascripts/discourse/app/static/wizard/components/wizard-field.gjs

@@ -90,6 +90,15 @@ export default class WizardFieldComponent extends Component {
           }}
         />
       {{/if}}
+
+      <PluginOutlet
+        @name="below-wizard-field"
+        @outletArgs={{hash
+          id=@field.id
+          disabled=@field.disabled
+          value=@field.value
+        }}
+      />
     </div>
   </template>
 }