Ensure only relevant/valid data types are made available

[nkylstad]

Description

One restriction that has been implemented with regards to allowing a data type other than the default, is that the maxCount property for the data type must be 1. This means that it is only allowed to refer to:

• default data type for the layoutset, OR
• another data type that has the restriction maxCount: 1.

We need to ensure that the list of data types that we make available takes this into account, and doesn't just list all data types with appLogic.

Additional Information

We need to check if this is implemented, and add that check if not.

Tasks

No response

Acceptance Criterias

No response

[lassopicasso]

Is blocked until #13764 is solved