Closes #9073: Remote data support for config contexts (#11692)

* WIP

* Add bulk sync view for config contexts

* Introduce 'sync' permission for synced data models

* Docs & cleanup

* Remove unused method

* Add a REST API endpoint to synchronize config context data

netbox/extras/forms/mixins.py

@@ -2,13 +2,15 @@ from django.contrib.contenttypes.models import ContentType
 from django import forms
 from django.utils.translation import gettext as _
 
+from core.models import DataFile, DataSource
 from extras.models import *
 from extras.choices import CustomFieldVisibilityChoices
-from utilities.forms.fields import DynamicModelMultipleChoiceField
+from utilities.forms.fields import DynamicModelChoiceField, DynamicModelMultipleChoiceField
 
 __all__ = (
     'CustomFieldsMixin',
     'SavedFiltersMixin',
+    'SyncedDataMixin',
 )
 
 
@@ -72,3 +74,19 @@ class SavedFiltersMixin(forms.Form):
             'usable': True,
         }
     )
+
+
+class SyncedDataMixin(forms.Form):
+    data_source = DynamicModelChoiceField(
+        queryset=DataSource.objects.all(),
+        required=False,
+        label=_('Data source')
+    )
+    data_file = DynamicModelChoiceField(
+        queryset=DataFile.objects.all(),
+        required=False,
+        label=_('File'),
+        query_params={
+            'source_id': '$data_source',
+        }
+    )