feat(file-processing): prevent submission of interleaved fastq files

[anna-parker]

This solves #6856 but is too inefficient atm to merge - we should use a bloomfilter like in the ena code base

I uploaded some mpox SRA fastq files and these lead preprocessing to fail with a timeout - 5min was not enough! Checking the logs it takes almost 3 whole minutes to download the S3 files... even when gzipped (80M)

Screenshot

PR Checklist

• All necessary documentation has been adapted.
• The implemented feature is covered by appropriate, automated tests.
• Any manual testing that has been done is documented (i.e. what exactly was tested?)

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[claude]

This PR may be related to: #6856 (MVP: Handle interleaved fastq submissions) — the diff explicitly rejects interleaved FASTQ files (both same-name and CASAVA-style mate-number formats) in file_validation.py, which matches that issue's request. Also possibly related: #6906 (MVP: Validate fastq files) and #6934 (Update ENA deposition and file validation code to allow BAM file submission), given the new file-processing service also validates FASTQ/BAM formats.