feat(ingest): Raise ingest error if we ever have multiple loculus accession for one insdc accession in loculus

[anna-parker]

resolves #

preview URL: https://ingest-error.loculus.org/

Summary

Raise an error in ingest if we ever have multiple loculus accession for one insdc accession loculus.

This si still too late (i.e. the duplication has already occured) but will warn us and hopefully make the logs a bit cleaner.

Screenshot

PR Checklist

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

[anna-parker]

I see this in the backend logs:

2024-09-19 12:19:05,671 INFO [http-nio-8079-exec-9] [west-nile] - org.loculus.backend.log.ResponseLogger: GET https://backend-ingest-error.loculus.org/west-nile/get-original-metadata - Responding with status 200
2024-09-19 12:19:07,951 INFO [http-nio-8079-exec-4] [ebola-zaire] - org.loculus.backend.log.ResponseLogger: GET https://backend-ingest-error.loculus.org/ebola-zaire/get-original-metadata - Responding with status 200
2024-09-19 12:19:46,190 INFO [http-nio-8079-exec-3] [west-nile] - org.loculus.backend.log.ResponseLogger: GET https://backend-ingest-error.loculus.org/west-nile/get-original-metadata - Responding with status 200

but I only see one request from west-nile ingest