[FEATURE] Port pytest with --migrate-pytest-hard

[GallVp]

Is your feature request related to a problem? Please describe

Use nf-core -v modules create --migrate-pytest --migrate-pytest-hard <tool/subtool> to migrate to nf-test.

I am experimenting with this command variant to automate pytest migration as much as possible. See fork: https://github.com/GallVp/nf-core-tools/tree/migpyt

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