Mock classes child factories should depend on interface, not implementation

[griest024]

Feature description

Mock model classes currently usually specify child factories by implementation, e.g.:

constructor(
  protected modelFactory: DaffModelFactory
) {}

instead these should only specify the interface:

constructor(
  protected modelFactory: IDaffModelFactory<DaffModel>
) {}

Use case

No response

Prior work

No response

Daffodil version

0.90

Additional context

No response