Add functional tests for the snapshot type

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Migrated from D7924 (view on Phabricator)

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Patch application report for D7924 (id=28549)

Rebasing onto 00768c2e...

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commit c8ef46e7604f8cd118abd385ec777f02e71e24fa
Author: Jayesh Velayudhan <jayesh@softwareheritage.org>
Date:   Mon May 30 17:10:46 2022 +0200

    Add functional tests for the snapshot type

See https://jenkins.softwareheritage.org/job/DGQL/job/tests-on-diff/37/ for more details.

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