Update GNU sort to comply to nf-core guidelines

[mahesh-panchal]

Description

• Moves ext.suffix to input - part of [FEATURE] Update modules to remove undocumented task.ext fields #8716
• Unifies nf-test configs
• Corrects a test input

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 module conventions in the contribution docs
• If necessary, include test data in your PR.
• Remove all TODO statements.
• Broadcast software version numbers to topic: versions - See version_topics
• Follow the naming conventions.
• Follow the parameters requirements.
• Follow the input/output options guidelines.
• Add a resource label
• Use BioConda and BioContainers if possible to fulfil software requirements.
• Ensure that the test works with either Docker / Singularity. Conda CI tests can be quite flaky:
  • For modules:
    • nf-core modules test <MODULE> --profile docker
    • nf-core modules test <MODULE> --profile singularity
    • nf-core modules test <MODULE> --profile conda
  • For subworkflows:
    • nf-core subworkflows test <SUBWORKFLOW> --profile docker
    • nf-core subworkflows test <SUBWORKFLOW> --profile singularity
    • nf-core subworkflows test <SUBWORKFLOW> --profile conda

[mahesh-panchal]

Why does this one pass? The gnu sort input is not updated

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Reason: Nextflow <=25 only prints a WARN when tuple cardinality doesn't match. Using nextflow.enable.strict = true catches it.

[fellen31]

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