Closes #17725: Clean up import statements (#17728)

* #17725: Resolve all F401 errors

* Tweak noqa designation

netbox/core/api/schema.py

@@ -8,10 +8,8 @@ from drf_spectacular.plumbing import (
     build_basic_type, build_choice_field, build_media_type_object, build_object_type, get_doc,
 )
 from drf_spectacular.types import OpenApiTypes
-from rest_framework import serializers
-from rest_framework.relations import ManyRelatedField
 
-from netbox.api.fields import ChoiceField, SerializedPKRelatedField
+from netbox.api.fields import ChoiceField
 from netbox.api.serializers import WritableNestedSerializer
 
 # see netbox.api.routers.NetBoxRouter

netbox/core/api/serializers_/jobs.py

@@ -1,5 +1,3 @@
-from rest_framework import serializers
-
 from core.choices import *
 from core.models import Job
 from netbox.api.fields import ChoiceField, ContentTypeField