Closes #6414: Enable assigning prefixes to various object types (#17692)

* Replace site FK on Prefix with scope GFK

* Add denormalized relations

* Update prefix filters

* Add generic relations for Prefix

* Update GraphQL type for Prefix model

* Fix tests; misc cleanup

* Remove prefix_count from SiteSerializer

* Remove site field from PrefixBulkEditForm

* Restore scope filters for prefixes

* Fix scope population on PrefixForm init

* Show scope type

* Assign scope during bulk import of prefixes

* Correct handling of GenericForeignKey in PrefixForm

* Add prefix counts to all scoped objects

* Fix migration; linter fix

* Add limit_choices_to on scope_type

* Clean up cache_related_objects()

* Enable bulk editing prefix scope

netbox/templates/ipam/prefix.html

@@ -44,17 +44,13 @@
             {% endif %}
           </td>
         </tr>
-        {% if object.site.region %}
-          <tr>
-            <th scope="row">{% trans "Region" %}</th>
-            <td>
-              {% nested_tree object.site.region %}
-            </td>
-          </tr>
-        {% endif %}
         <tr>
-          <th scope="row">{% trans "Site" %}</th>
-          <td>{{ object.site|linkify|placeholder }}</td>
+          <th scope="row">{% trans "Scope" %}</th>
+          {% if object.scope %}
+            <td>{{ object.scope|linkify }} ({% trans object.scope_type.name %})</td>
+          {% else %}
+            <td>{{ ''|placeholder }}</td>
+          {% endif %}
         </tr>
         <tr>
           <th scope="row">{% trans "VLAN" %}</th>