Remove docker.userEmulation

[ewels]

This option is about to be stripped out of Nextflow itself, so we need to remove it from the nf-core template.

See nextflow-io/nextflow#4596

Should maybe consider adding a lint test that checks if the option is present? Though I don't think it'll trigger any errors or anything if left in, just be silently ignored. Setting docker.fooNotexists = true in a config seems to have no effect.

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

[ewels]

See nextflow-io/nextflow#4601 for discussion about replacements.

[ewels]

Rebased the branch to try to sort out the git commit history. Hopefully ok to merge now.

[ewels]

Third time lucky..

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e33989a) 75.06% compared to head (aa5febe) 75.06%.
Report is 7 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #2580   +/-   ##
=======================================
  Coverage   75.06%   75.06%           
=======================================
  Files          85       85           
  Lines        9376     9376           
=======================================
  Hits         7038     7038           
  Misses       2338     2338           

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