Use query variables instead of f-strings in functional tests

Related to #4306 (closed)

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• T4306 is now #4306 (closed)

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commit 2c457bf0bc7f5de2fcb9bb11b505b496f4a064b8
Author: Jayesh Velayudhan <jayesh@softwareheritage.org>
Date:   Tue Jun 14 15:46:21 2022 +0200

    Use query variables instead of f-strings in functional tests
    
    Related to #4306

See https://jenkins.softwareheritage.org/job/DGQL/job/tests-on-diff/60/ for more details.

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