template: workflow output for multiQC

[maxulysse]

to merge after:

• TEMPLATE: add a fallback for new outputdir parameter #3798
• future PR that bumps minimal NXF to 25.10

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

[mashehu]

@nf-core-bot changelog

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.39%. Comparing base (9df2b3b) to head (75e8484).

☔ View full report in Codecov by Sentry.
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[maxulysse]

This feature is also available as a preview in Nextflow 24.04, 24.10, and 25.04. If you are upgrading from a preview version of workflow outputs, you must remove the nextflow.preview.output feature flag, as it is not supported in Nextflow 25.10.