Integrate multiqcsav to pipeline

[delfiterradas]

PR checklist

• This comment contains a description of changes (with reason).
• If you've fixed a bug or added code that should be tested, add tests!
• If you've added a new tool - have you followed the pipeline conventions in the contribution docs
• If necessary, also make a PR on the nf-core/demultiplex branch on the nf-core/test-datasets repository.
• Make sure your code lints (nf-core pipelines lint).
• Ensure the test suite passes (nextflow run . -profile test,docker --outdir <OUTDIR>).
• Check for unexpected warnings in debug mode (nextflow run . -profile debug,test,docker --outdir <OUTDIR>).
• Usage Documentation in docs/usage.md is updated.
• Output Documentation in docs/output.md is updated.
• CHANGELOG.md is updated.
• README.md is updated (including new tool citations and authors/contributors).

[delfiterradas]

@matthdsm this is a draft PR to test the changes from nf-core/modules#10320 in the demultiplex pipeline.

Some additional changes have been made to the subworkflow, but I think there are still some fixes that need to be made in the generateReadgroupBCLCONVERT function, since the test profile currently because the obtained fastq paths are incorrect

[apeltzer]

Thanks @delfiterradas - looks great and report is there as far as I can see in the test run :-)