Handle compressed content in dataset preview for all sequence classes

[PlushZ]

This PR fixes #15653
Method display_data moved to common class for fasta and fastq instead being used only in fasq class.

How to test the changes?

(Select all options that apply)

• 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]

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.

[bgruening]

Thanks @PlushZ. Can you please run make format or fix the failing python linting's

[mvdbeek]

The class names should be the other way around, Base* something should be the thing you inherit from. I don't think there's a reason you could not push the display_data method right into the current Sequence class (and replace Sequence.display_data(self, trans, dataset, preview, filename, to_ext, **kwd) with super().display_data(self, trans, dataset, preview, filename, to_ext, **kwd))

[PlushZ]

Thanks for comment, I agreed and modified accordingly. As I understand, there is no need to pass self argument when using super() because it automatically passes self. But I don't know why the tests still use the version where self was explicitly passed, which leads to argument mismatches and results errors "too many arguments" in the method call. Removing self should resolve these errors.

[PlushZ]

Now all seems to be fine

[mvdbeek]

Thanks @PlushZ!