Make swh/indexer/tests/test_origin_metadata.py run faster.

~10 seconds is too much time.

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Migrated from T1394 (view on Phabricator)

added Indexer label

added priority:Low label

assigned to @vlorentz

Tests should be refactored to use celery's pytest fixtures, see swh-scheduler!44 (closed)

Resolved by !100 (closed).

closed