Add translation profile option to configure if failure to add gerelateerde zaken should result in warnings or errrors

[MLenterman]

It could be critical to the process to ensure that all gerelateerde zaken are added to a zaak, so throwing an error when adding gerelateerde zaken fails, will ensure data consistency by rolling back the whole action (not implemented yet). For other processes gerelateerde zaken could be not so important and it would be preferable to only give a warning when adding gerelateerde zaken fails, so that the process can move on without interruption.

There are also a variety of technical reason why adding a gerelateerde zaak could fail. For example: Adding a closed zaak as gerelateerde zaak without zaken.geforceerd_bijwerken permission scope, or adding a zaak as gerelateerde zaak that is not present in OpenZaak.

• Add property to translation profile (example: "relatedCaseFailureBehavior": "warn/error")
• Add testcases for both warn and error situations.
• Default behavior should be error