Dependent field is replaced with empty markup when placed inside a field group

Problem/Motivation

When a dependent field is placed inside a field group, changing the parent field replaces the dependent field's wrapper into an empty string, so the field disappears from the form.

ViewsSelection::updateDependentField() renders the element manually with $renderer->render($form_field). Elements that belong to a group carry #group, and RenderElementBase::preRenderGroup() defers their rendering to the group container — a direct render returns an empty string. Core handles this in ajax callbacks by unsetting #group before rendering, see \Drupal\Core\Form\FormAjaxResponseBuilder::buildResponse().

Proposed resolution

Unset #group on the element before rendering it for the ReplaceCommand, mirroring core's FormAjaxResponseBuilder.