Status and error codes for the POST rule exceptions API

Code Message
201 Created
206 Partial success (this code is returned when we success to create/update some main entities and further flow if failed. This code require data verification in UI and in DLP tomcat logs to identify what part wasn't created/updated.)
400 Input validation error
403 Forbidden (authentication failed)
409 Conflict (environment under deployment or policy upgrade)
420 Resources not found (policy not found)
500 Internal server error