Replace ubuntu for all modules using it - meta PR

[maxulysse]

docker: https://wave.seqera.io/view/builds/bd-838ba80435a629f8_1
singularity: https://wave.seqera.io/view/builds/bd-2f90c612c8e49f19_1

modules left in this PR are:

• cat/fastq
• custom/tabulartogseacls
• custom/tabulartogseagct
• igv/js
• md5sum
• shasum

Other modules have been split out:

• gunzip is in split out gunzip from #7215 #7221
• untar is in Split untar out from #7215 #7222

Conda in Pytest has been fixed in #7219

PR checklist

Closes #5968

• 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.
• Emit the versions.yml file.
• 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

[edmundmiller]

LGTM!

Should probably bump up the docs, I think they say somewhere to use ubuntu as a base.