pypi/loader: Filter out sdist archives not of interest
Some PyPI origins declare sdist archives that cannot be extracted by swh.core.tarball.uncompress and their content do not match standard sdist layout.
This is notably the case for sdist files whose extensions are .deb, .egg, .rpm or .whl.
As those artifacts are not of interest to archive and generate errors while loading PyPI origins, filter them out from the sdist files to process.
Related to #3575 (closed)
Migrated from D6270 (view on Phabricator)