✨ Add IModel generation for Items that are not in Collections

[aorabdel]

Description

The only Items that get extended to implement IModel are Items inside Collections, which is not the exclusive list of Items we want to extend, some x-job Items are defined but not in a collection.
This changes generates IModel methods to job items that are not in Collections.

Test Coverage

• This change is covered by existing or additional automated tests.
• Manual testing has been performed (and evidence provided) as automated testing was not feasible.
• Additional tests are not required for this change (e.g. documentation update).

[acabarbaye]

Looks good to me