feat: Generate unique and descriptive filenames for download

[fhennig]

resolves #2327
resolves #2689

preview URL: https://feat-2327-better-download.loculus.org

Summary

Generates filenames like cchf_nuc_2024-10-23T1225.fasta for the files that are downloaded from the DownloadDialog.

PR Checklist

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

[corneliusroemer]

The preview url doesn't work because we only put the first 25 characters in the URL, if you use shorter branch names it's easier to guess the branch name. But you can look the actual url up in argocd:

[corneliusroemer]

Great stuff, works well, just realized that my spec wasn't entirely complete re casing irregularity - I think changing camelCase to kebab-case would be good, and probably using "sequences" instead of "unaligned-nucleotide-sequences"

Otherwise the file names get possibly quite too long

[fhennig]

Thanks for the feedback, I already thought that we might iterate on the exact filename, but I was happy with getting all the components in place. I agree on the casing stuff and the filename being to long, I like all your suggestions!

[corneliusroemer]

I just realized we don't indicate segments/genes in sequence file names. Might be nice to add that after the respective seq type:

nuc-L or aa-aligned-2K

This only applies to segmented nucs and AAs (if it's main then leave it out)

[corneliusroemer]

This is great, just some small non-blocking suggested! We can iterate on the rest as we go, nothing blocking!

[fhennig]

Thanks for the review!

I didn't make these test changes as I prefer to keep unit tests with rather less than more levels of indirection and templating.