Easier PCI DSS compliance for payment pages (#4273)

* Assign names to compressed scripts

* Make PCI-relevant pages detectable

* Make payment summary markup more consistant to easy work in tracking plugin

* Add docs note

src/pretix/plugins/paypal2/templates/pretixplugins/paypal2/presale_head.html

@@ -2,7 +2,7 @@
 {% load compress %}
 {% load i18n %}
 
-{% compress js %}
+{% compress js file paypal %}
     <script type="text/javascript" src="{% static "pretixplugins/paypal2/pretix-paypal.js" %}"></script>
 {% endcompress %}
 

src/pretix/plugins/paypal2/views.py

@@ -185,6 +185,10 @@ class XHRView(View):
 class PayView(PaypalOrderView, TemplateView):
     template_name = ''
 
+    def dispatch(self, request, *args, **kwargs):
+        self.request.pci_dss_payment_page = True
+        return super().dispatch(request, *args, **kwargs)
+
     def get(self, request, *args, **kwargs):
         if self.payment.state != OrderPayment.PAYMENT_STATE_CREATED:
             return self._redirect_to_order()