[24.0] Make sure that all Linter subclasses are imported for listing them

[bernt-matthias]

Otherwise planemo prints out an error Unknown linter type(s) .... (and continues anyway ... but I think we should fix this).

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• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

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[jdavcs]

I think that's fine.

[jdavcs]

Given that we are touching this method here, and assuming the method name is a typo from #17081), should we change it back to list_linters? (this would have to be fixed in planemo too - there's one call in lint.py.

[nsoranzo]

You also need to fix the type in test/unit/tool_util/test_tool_linters.py

[bernt-matthias]

@nsoranzo Can't find a solution to define an alias for a class method (and in particular no nice solution).

[nsoranzo]

@bernt-matthias I'll push a fix to your branch.

[github-actions]

This PR was merged without a "kind/" label, please correct.