fix(website): only put fasta Id into fastaIds in edit page

[corneliusroemer]

resolves #5627

🚀 Preview: Add preview label to enable

[anna-parker]

could you add some of the integration test changes I made in https://github.com/loculus-project/loculus/pull/5629/files?

Update: I cherrypicked your changes into #5629, added tests and made the difference between header and ID clearer on the edit page

[corneliusroemer]

could you add some of the integration test changes I made in https://github.com/loculus-project/loculus/pull/5629/files?

They don't matter? This fix here is contained and should be good to go?

[anna-parker]

In https://github.com/loculus-project/loculus/pull/5629/files I also improve the error message - we were checking if the full fasta header was the same not the fasta ID. If we only merge these changes here a user could submit a sequence with the same fastaID and a different description - causing submission issues when this is sent to the backend

[corneliusroemer]

superseded by #5629