jenkins: Allow debian build jobs to not download/upload artifact from pypi

That avoids the 'gbp import-orig' step. Which avoid to install the pypi-upload [1] setup in the package recipe [2]

for example, there is no reference in [2] about upload-pypi step.

• [1] https://forge.softwareheritage.org/source/swh-jenkins-jobs/browse/master/jobs/swh/indexer.yaml$8

• [2] https://forge.softwareheritage.org/source/swh-jenkins-jobs/browse/master/jobs/swh/mirakuru.yaml

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Migrated from D1068 (view on Phabricator)