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loader: Ensure to fetch latest snapshot produced by a git visit type

Antoine Lambert requested to merge anlambert/swh-loader-git:get_latest_snapshot_for_git_visit_type into master

SWH data model allows an origin to have multiple visit types, in particular a git origin can have visit types 'git' and 'git-checkout'.

We must ensure to retrieve the latest snapshot for a git visit type in the git loader implementation as it can break incremental loading of a git origin having both visit types mentioned above.

Indeed a 'git-checkout' visit type produces a snapshot with a single branch while a 'git' visit type produces a snapshot containing all branches of the loaded repository. Previously, if the latest snapshot retrieved was produced by a 'git-checkout' visit type, the loader would refetch all branches and associated git objects while most of them have already been archived.

Related to swh/meta#5092.

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