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Refactor swh module to computes canonical github origins

Reusing the swh.core.github.utils.GitHubSession class.

Extra plan:

Refactor swh.web to canonicalize the gh origin server side
Adapt packagist lister
Adapt remaining listers if any
Adapt nixguix loader (or lister if it got refactored prior to this)

Migrated from T4279 (view on Phabricator)