* Removed conflicting lint and isort check in model helpers seems it's not appearing anymore
* Removed disabled linting for accessing private method. `parent_foreign_key_mappings` becomes public because it is accessed by other instance than `self`.
* Updated model's helper - removed unecessary exception and replaced with check while accessing global context to reset ownerships.
* Updated model's helper - renamed unused attribute to private in user link method.
* Updated model's helper - added specific exception for adding extra json column. Removed disabled pylint rule.
* Applied changes after review to `models/helpers.py`:
- removed unecesary function's param rename
- added extra JSON content in exception
* Removed self.extra_json content from exception message.
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