swh.lister.core: Remove abstractmethod

Some of the new listers like GNU and CRAN do not follow the conventional way of making an HTTP request, hence they do not need some of the methods which are usually needed by in conventional HTTP request.

But those methods are marked abstractmethod in the core making them necessary to be present. So it is in best to remove abstractmethod to increase the readability of those listers.

@ardumount stated in !369 (closed) to remove those decorators from the base class as they makes code immediately harder to read and will make it harder to maintain later.

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Migrated from D1566 (view on Phabricator)

Build is green See https://jenkins.softwareheritage.org/job/DLS/job/tox/172/ for more details.

Now, I'd say merge this first in the swh-lister repository. Then rebase the cran/gnu lister diffs to the latest master branch.

And you shall then be able to remove the unnecessary override methods in those listers. And then update the diffs.

TIA

Cheers,

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