Use the new API error format in StartProcess

Erwan Rouchet
2026-03-02T11:33:44Z

https://redmine.teklia.com/issues/11464

Requires #2037

The new API error format should be implemented on the `StartProcess` endpoint, and the existing unit tests should be updated.

The [best practices](https://redmine.teklia.com/proje...

https://redmine.teklia.com/issues/11464

Requires #2037 (closed)

The new API error format should be implemented on the StartProcess endpoint, and the existing unit tests should be updated.

The best practices have details on how to implement this, including adding error codes to messages so that they do not always use the default code invalid.

This endpoint is only used by the frontend, and the error handling will need to be updated.