tests: Simplify archive.origin_visit_find_by_date testing

Simplify test to ensure it does not fail when building debian packages.

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Migrated from D7157 (view on Phabricator)

Build is green

Patch application report for D7157 (id=25944)

Rebasing onto d5589ca5...

Current branch diff-target is up to date.

Changes applied before test

commit 09b8522455e6d1421c2a98a689116d20bc357880
Author: Antoine Lambert <anlambert@softwareheritage.org>
Date:   Fri Feb 11 14:11:29 2022 +0100

    tests: Simplify archive.origin_visit_find_by_date testing
    
    Simplify test to ensure it does not fail when building debian packages.

See https://jenkins.softwareheritage.org/job/DWAPPS/job/tests-on-diff/1380/ for more details.

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