Check category_tree datasets synchronisation
Two more checks in validate-storage.py:
- checks if a dataset declared in category_tree.json is present on disk
- error_code:
dataset-not-found-on-storage
- error_code:
- checks if a dataset present in json-data folder is referenced in category_tree.json
- error_code:
dataset-not-found-in-category-tree
- error_code:
This MR was inspired by this issue