test_cookers: Turn git_loader into a pytest fixture

It enables to remove some code duplication related to git loader creation when executing tests.

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Migrated from D4135 (view on Phabricator)

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Patch application report for D4135 (id=14580)

Rebasing onto 7af35ae9...

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commit a8fa57718b694d8c50e166910a5ed9549fc5a246
Author: Antoine Lambert <antoine.lambert@inria.fr>
Date:   Fri Oct 2 20:52:26 2020 +0200

    test_cookers: Turn git_loader into a pytest fixture
    
    It enables to remove some code duplication related to git loader creation
    when executing tests.

See https://jenkins.softwareheritage.org/job/DVAU/job/tests-on-diff/19/ for more details.

mentioned in merge request !63 (closed)

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