include errors.js by default and make it coop with async_task_replace_page (Z#23236752) (#6284)

* load errors.js as standard and make it coop with async_task_replace_page

* scope down event

* Update src/pretix/static/pretixbase/js/asynctask.js

Co-authored-by: pajowu <engelhardt@pretix.eu>

* drop the jquery dependency for error.js

Co-authored-by: pajowu <pajowu@pajowu.de>

* include errors.js in error.html

* include errors.js in control base.html

* Update src/pretix/static/pretixbase/js/asynctask.js

Co-authored-by: Richard Schreiber <schreiber@pretix.eu>

* put errors.js in an IIFE call

---------

Co-authored-by: pajowu <engelhardt@pretix.eu>
Co-authored-by: pajowu <pajowu@pajowu.de>
Co-authored-by: Richard Schreiber <schreiber@pretix.eu>

src/pretix/base/templates/error.html

@@ -11,6 +11,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <meta charset="utf-8">
     <link rel="icon" href="{% static "pretixbase/img/favicon.ico" %}">
+    <script type="text/javascript" src="{% static "pretixbase/js/errors.js" %}"></script>
     {% block custom_header %}{% endblock %}
     {% if css_theme %}
         <link rel="stylesheet" type="text/css" href="{{ css_theme }}" />
@@ -20,6 +21,5 @@
 <div class="container">
     {% block content %}{% endblock %}
 </div>
-<script src="{% static "pretixbase/js/errors.js" %}"></script>
 </body>
 </html>