Don't use interfaces for API models

[jsonBackup]

Describe the bug
Right now, the code is trying to type API models with TypeScript interfaces, like this::

MORYX-Framework/src/Moryx.Operators.Web/src/app/models/operator-view-model.ts

Line 26 in 0b76f08

.requiredSkills?.map(x => <IOperatorSkillCapability>{

requiredSkills: workstation.data .requiredSkills?.map(x => <IOperatorSkillCapability>{ name: x })

Additional context
IOperatorSkillCapability doesn’t exist anymore. Even if it did, interfaces can’t be used for API models. Instead use classes.

[dbeuchler]

@jsonBackup is this now a bug which brings the UI to fail? Is it required to fix for 10.0.0 release?