Add new global setting to control auto-upload of test reports (#3137)

* Add new global setting to control auto-upload of test reports

* Adds callback to attach a copy of the test report when printing

* Fix for all attachment API endpoints

- The AttachmentMixin must come first!
- User was not being set, as the custom 'perform_create' function was never called

* Remove duplicated UserSerializer

* display uploading user in attachment table

* Add unit test to check the test report is automatically uploaded

InvenTree/part/serializers.py

@@ -94,6 +94,8 @@ class PartAttachmentSerializer(InvenTreeAttachmentSerializer):
             'link',
             'comment',
             'upload_date',
+            'user',
+            'user_detail',
         ]
 
         read_only_fields = [