Inform user of consequences of switching datamodel in layoutset

[nkylstad]

Description

See analysis #12739

Additional Information

No response

Tasks

Implement updated description text that informs user of consequences of changing data model on layoutset.

Acceptance Criterias

• When adding a new data model to a layoutset in process config (i.e. one that does not have a data type connection), the old description ("Velg en datamodell å knytte til prosessteget") is shown in edit mode.
• When editing a data model connection for layoutset in process config (i.e. data model has already been set), the new description ("u har allerede valgt en datamodell. Hvis du har brukt denne datamodellen i et skjema, kan du få ugyldige knytninger til datamodellfelt i skjemaet. Du får en feilmelding om hvilke felter det gjelder, i forhåndsvisningen") is shown.