ksize, molecule passing from csv into all processes

[pranathivemuri]

nf-core/predictorthologs pull request

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• [ ] This comment contains a description of changes (with reason)
• [ ] If you've fixed a bug or added code that should be tested, add tests!
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[olgabot]

This PR moves the test_download_refseq test into a separate file allowing for failure and may help with getting the tests to pass faster: https://github.com/czbiohub/nf-predictorthologs/pull/66

[pranathivemuri]

closing this PR for now, will revisit once we have more clarity on what can be improved on figuring out the csv file parameters like ksize, molecule inside nextflow