Add INSDC accession to results of ena submission and upload to backend.

[anna-parker]

resolves #

preview URL:

Summary

1. Maps results of successful ENA assembly submission to insdc_accession_base and insdc_accession_full and uploads these results to Loculus - handles the case with a single and also a multi-segment organism:

2. Tested locally and updated README with exact commands for local testing and additional warnings.
3. Refactored code to have --test flag (determines if ENA dev or prod is used) that is set at config level to make code clearer.

Screenshot

PR Checklist

• All necessary documentation has been adapted.
• The implemented feature is covered by an appropriate test.

[corneliusroemer]

Looks great - haven't tested or reviewed closely, will familiarize myself with the code once we've got the submission running.