Add raw ENA test file + update ISA JSON accordingly + update to target_repository

[bedroesb]

Feedback from Phillippe :

• [x] id for study and investigation is empty. Why does the pydentic model not fail?
• [x] investigatiom / filename should start with i_ (same for a s) . Add to pydentic model
• [x] factor values and units can be empty an empty list
• [x] Add checksum type to file
• [x] check if file checksum is a correct attribute (not snakecase?)

[kdp-cloud]

• [ ] id for study and investigation is empty. Why does the pydentic model not fail?

The test data below does not have an id field either. We can make it more strict but we should replace the test data first. https://github.com/elixir-europe/MARS/blob/e39fdfc18dcf2cc74ab7b30f77e75a5c261647fb/test-data/ISA-BH2023-ALL/isa-bh2023-all.json