fix(jellyfish/count): support multiple input files - #13079

fasta only supports getName() when one file is staged. Nextflow hands multi-file input to the process as a BlankSeparatedList, and paired-end runs abort at line 23 with MissingMethodException.

The script now iterates a normalised file list. Each .gz member gets a dedicated gunzip command and every decompressed name reaches jellyfish count. One-file calls keep their old behaviour. meta.yml describes the input as file-or-list.

Verification comes from sarscov2 - fastq - paired end, which fails against the old script with the same error and succeeds here.

Generated by Devin

PR checklist

Closes #13048

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