Refactor dataset versioning

#### Description:

after #3510 we should also refactor the versioning of the datasets, leveraging the converters to store the dataset paths. This should now be possible with the upgraders and converters all being part of the Versioning_Engine. The previous parallel system was put in place as that information was previously only available in Versioning_Toolkit.

Did not want to impose even more changes on the linked PR, so instead simply made it work, as in, added a fix in https://github.com/BHoM/BHoM_Engine/pull/3510/commits/0a92e1b2590172385f1a48f8d95bb0e5ad97cef9 that loads the json files, as the structure of them was changed.