ISTWCMS-3505: adding templates for header

templates/blocks/block--uw-fdsu-theme-resp-uw-block-global-header-menu.html.twig

+{% block content %}
+  {{ content }}
+{% endblock %}

templates/menus/menu--uw-menu-global-header.html.twig

+{% include "@components/menu/menu--header/menu--header.twig" with {
+  'items': items
+} %}