Closes #19924: Record model features on ObjectType (#19939)

* Convert ObjectType to a concrete child model of ContentType

* Add public flag to ObjectType

* Catch post_migrate signal to update ObjectTypes

* Reference ObjectType records instead of registry for feature support

* Automatically create ObjectTypes

* Introduce has_feature() utility function

* ObjectTypeManager should not inherit from ContentTypeManager

* Misc cleanup

* Don't populate ObjectTypes during migration

* Don't automatically create ObjectTypes when a ContentType is created

* Fix test

* Extend has_feature() to accept a model or OT/CT

* Misc cleanup

* Deprecate get_for_id() on ObjectTypeManager

* Rename contenttypes.py to object_types.py

* Add index to features ArrayField

* Keep FK & M2M fields pointing to ContentType

* Add get_for_models() to ObjectTypeManager

* Add tests for manager methods & utility functions

* Fix migrations for M2M relations to ObjectType

* model_is_public() should return False for non-core & non-plugin models

* Order ObjectType by app_label & model name

* Resolve migrations conflict

netbox/core/models/jobs.py

@@ -20,6 +20,7 @@ from core.choices import JobStatusChoices
 from core.dataclasses import JobLogEntry
 from core.models import ObjectType
 from core.signals import job_end, job_start
+from netbox.models.features import has_feature
 from utilities.json import JobLogDecoder
 from utilities.querysets import RestrictedQuerySet
 from utilities.rqworker import get_queue_for_model
@@ -148,7 +149,7 @@ class Job(models.Model):
         super().clean()
 
         # Validate the assigned object type
-        if self.object_type and self.object_type not in ObjectType.objects.with_feature('jobs'):
+        if self.object_type and not has_feature(self.object_type, 'jobs'):
             raise ValidationError(
                 _("Jobs cannot be assigned to this object type ({type}).").format(type=self.object_type)
             )