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/ipam/apps.py

@@ -1,5 +1,7 @@
 from django.apps import AppConfig
 
+from netbox import denormalized
+
 
 class IPAMConfig(AppConfig):
     name = "ipam"
@@ -8,6 +10,16 @@ class IPAMConfig(AppConfig):
     def ready(self):
         from netbox.models.features import register_models
         from . import signals, search  # noqa: F401
+        from .models import Prefix
 
         # Register models
         register_models(*self.get_models())
+
+        # Register denormalized fields
+        denormalized.register(Prefix, '_site', {
+            '_region': 'region',
+            '_sitegroup': 'group',
+        })
+        denormalized.register(Prefix, '_location', {
+            '_site': 'site',
+        })